try the app live at this link http://canvasplay.codemagic.app
it+s a clean up and porting to flutter web of this code https://github.com/starterboost/flutter_canvas_experiment
also read how to get free hosting for static pages with codemagic https://blog.codemagic.io/build-and-host-your-flutter-web-apps-on-codemagic/