After implementing our flying_balls application, we had a look at the game "Bubble Trouble", where a player fires on bouncing balls (resp. bubbles). You can find an online version of this game here.
Mitch Koko has published a lot of videos where he is implementing simple versions of several games, e.g. Tetris, Flappy Bird or Mine Sweeper, and also for Bubble Trouble. See a list of all his videos here and the video on Bubble Trouble here.
Mitch said, that the code developed in these videos can be found on his home page, but unfortunately we did not find it. What we found was e.g. a page, where you can download his code for Tetris, but you have to pay for it, even it's only 5$, see here.
But on GitHub we found several repositories where Bubble Trouble was implemented in Flutter according to Mitch's video, e.g. from Irina Vasilescu and a French developer called navalnorth.
We have forked navalnorth's repository into our fdg2425 GitHub account under bubbleTrouble_flutter_navalnorth_forked and in branch gs_ideas, we have implemented several enhancements, e.g.
We have created 3 WebApps to demonstrate what was implemented