Flutter Stack Widget onTap function not working

Here I'm facing a issue on Flutter stack widget ontap function.Many time i'm tring to do it , but i can't.

Here is a demo image, where I want to call onTap function.

Here is my code :

import 'dart:async';

import 'package:flutter/material.dart';

import 'package:flutter/services.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  SystemChrome.setSystemUIOverlayStyle(
    SystemUiOverlayStyle(
      statusBarIconBrightness: Brightness.dark,
      statusBarColor: Colors.transparent,
      systemNavigationBarColor: Colors.transparent,
    ),
  );
  runApp(SpinWheelApp());
}

class SpinWheelApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Demo App',
      home: TestDemo(),
    );
  }
}

class TestDemo extends StatefulWidget {
  @override
  State<TestDemo> createState() => _TestDemoState();
}

class _TestDemoState extends State<TestDemo> {
  int _gameRoundTime = 10;

  Future _startGame() async {
    _gameRoundTime = 10;
    Timer.periodic(Duration(seconds: 1), (timer) {
      setState(() {
        _gameRoundTime = _gameRoundTime - 1;
        if (_gameRoundTime <= 0) {
          timer.cancel();
          _gameRoundTime = 10;
        }
      });
    });
  }

  @override
  void initState() {
    super.initState();
  }

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      extendBody: true,
      resizeToAvoidBottomInset: false,
      body: Image.asset(
        'assets/images/bgImage.png',
        height: MediaQuery.of(context).size.height,
        width: MediaQuery.of(context).size.width,
        fit: BoxFit.fitHeight,
      ),
      // backgroundColor: Colors.red,
      bottomNavigationBar: FittedBox(
        child: Container(
          // height: MediaQuery.of(context).size.height -
          //     MediaQuery.of(context).size.height / 2.34,
          // height: MediaQuery.of(context).size.height - 220,

          width: 400,

          child: Column(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              InkWell(
                  onTap: () async {
                    _startGame();
                  },
                  child: Text('$_gameRoundTime')),
              SizedBox(),
              _buildItem(context),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildItem(
    BuildContext context,
  ) {
    return _centerItem(context);
  }

  Widget _centerItem(BuildContext context) {
    return Stack(
      alignment: Alignment.center,
      clipBehavior: Clip.none,
      children: [
        _bottomItem(context),
        Positioned(
          top: -240,
          child: Stack(
            alignment: Alignment.center,
            children: [
              _responsiveImage(
                image: 'centerItem.png',
              ),
              Positioned(
                child: InkWell(
                  onTap: () async {
                    await _startGame();
                  },
                  child: SizedBox(
                    width: MediaQuery.of(context).size.width,
                    child: TextButton(
                      onPressed: () async {
                        await _startGame();
                      },
                      child: Text(
                        'data',
                      ),
                    ),
                  ),
                ),
              ),
              Padding(
                padding: EdgeInsets.only(top: 57),
                child: Text(
                  _gameRoundTime == 10 ? 'Start' : '$_gameRoundTime\ s',
                  style: TextStyle(
                    fontSize: _gameRoundTime == 10 ? 12 : null,
                    color: Colors.white,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ),
            ],
          ),
        ),
        _positionButton(
          top: -347,
          children: [
            _responsiveImage(
              image: 'topCenter.png',
            ),
            Text(
              'x10',
              style: TextStyle(
                fontWeight: FontWeight.bold,
              ),
            ),
          ],
        ),
        // Positioned(
        //   top: -347,
        //   child: Stack(
        //     alignment: Alignment.center,
        //     clipBehavior: Clip.none,
        //     children: [
        // _responsiveImage(
        //   image: 'topCenter.png',
        // ),
        // Text(
        //   'x10',
        // ),
        //     ],
        //   ),
        // ),
        _positionButton(
          top: -345,
          left: 24,
          children: [
            _responsiveImage(
              image: 'topLeft1.png',
            ),
            Padding(
              padding: EdgeInsets.only(right: 10, top: 20),
              child: Text(
                'x5',
                style: TextStyle(
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
          ],
        ),
        // Positioned(
        //   top: -345,
        //   left: 24,
        // child: _responsiveImage(
        //   image: 'topLeft1.png',
        // ),
        // ),
        _positionButton(
          top: -345,
          right: 24,
          children: [
            _responsiveImage(
              image: 'topRight.png',
            ),
            Padding(
              padding: EdgeInsets.only(left: 5, top: 20),
              child: Text(
                'x15',
                style: TextStyle(
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
          ],
        ),
        // Positioned(
        //   top: -345,
        //   right: 24,
        //   child: _responsiveImage(
        //     image: 'topRight.png',
        //   ),
        // ),
        _positionButton(
          top: -215,
          left: 30,
          children: [
            _responsiveImage(
              image: 'centerLeft1.png',
            ),
            Padding(
              padding: EdgeInsets.only(right: 30, top: 25),
              child: Text(
                'x5',
                style: TextStyle(
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
          ],
        ),
        // Positioned(
        //   top: -215,
        //   left: 30,
        //   child: _responsiveImage(
        //     image: 'centerLeft1.png',
        //   ),
        // ),
        _positionButton(
          top: -215,
          right: 30,
          children: [
            _responsiveImage(
              image: 'rightCenter.png',
            ),
            Padding(
              padding: EdgeInsets.only(left: 30, top: 25),
              child: Text(
                'x25',
                style: TextStyle(
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
          ],
        ),
        // Positioned(
        //   top: -215,
        //   right: 30,
        //   child: _responsiveImage(
        //     image: 'rightCenter.png',
        //   ),
        // ),
        _positionButton(
          top: -175,
          left: 31,
          children: [
            _responsiveImage(
              image: 'bottomLeft.png',
            ),
            Padding(
              padding: EdgeInsets.only(right: 15, top: 35),
              child: Text(
                'x5',
                style: TextStyle(
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
          ],
        ),
        // Positioned(
        //   top: -175,
        //   left: 31,
        //   child: _responsiveImage(
        //     image: 'bottomLeft.png',
        //   ),
        // ),
        _positionButton(
          top: -175,
          right: 31,
          children: [
            _responsiveImage(
              image: 'bottomRight.png',
            ),
            Padding(
              padding: EdgeInsets.only(left: 5, top: 35),
              child: Text(
                'x45',
                style: TextStyle(
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
          ],
        ),
        // Positioned(
        //   top: -175,
        //   right: 31,
        //   child: _responsiveImage(
        //     image: 'bottomRight.png',
        //   ),
        // ),
        _positionButton(
          top: -120,
          children: [
            _responsiveImage(
              image: 'bottomCenter.png',
            ),
            Padding(
              padding: EdgeInsets.only(left: 5, top: 55),
              child: Text(
                'x5',
                style: TextStyle(
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
          ],
        ),
        // Positioned(
        //   top: -120,
        //   // right: 31,
        //   child: _responsiveImage(
        //     image: 'bottomCenter.png',
        //   ),
        // ),
      ],
    );
  }

  Widget _positionButton(
      {double? top,
      double? bottom,
      double? right,
      double? left,
      required List<Widget> children}) {
    return Positioned(
      top: top,
      bottom: bottom,
      right: right,
      left: left,
      child: Stack(
        alignment: Alignment.center,
        clipBehavior: Clip.none,
        children: children,
      ),
    );
  }

  Widget _bottomItem(BuildContext context) {
    return Stack(
      alignment: Alignment.bottomCenter,
      clipBehavior: Clip.none,
      children: [
        Positioned(
          bottom: 160,
          child: _responsiveImage(
            image: 'tower.png',
            height: 200,
          ),
        ),
        _bottomImage(context),
      ],
    );
  }
}

Widget _responsiveImage({
  required String image,
  double? height,
  double? width,
  void Function()? onTap,
}) {
  return InkWell(
    onTap: onTap,
    child: SizedBox(
      width: width,
      height: height,
      child: Image.asset(
        'assets/images/$image',
        fit: BoxFit.contain,
      ),
    ),
  );
}

Widget _bottomImage(BuildContext context) {
  return Center(
    child: FittedBox(
      child: SizedBox(
        width: MediaQuery.of(context).size.width,
        height: MediaQuery.of(context).size.width > 310 ? 200 : null,
        // height: bottomImageHeight,
        child: Image.asset(
          'assets/images/bottomItem.png',
          fit: BoxFit.fitWidth,
        ),
      ),
    ),
  );
}

i've pass Gesturedectector on _positionButton widget. When I click on button No response. Maybe some constraints box issue. please check and give me review.