I like the idea of a reverse breakout, but I found it a bit difficult to test just playing by myself. The controls work fine after getting used to it. I think it could be a little clearer what the goal of the game is. I wasn't really able to tell the difference between digesting yourself and being digested by the opponent.
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Thanks for playing! I definitely need to add some up front description of what you are trying to do. I'm not sure which version you played, but I recently made it so shooting one of the red balls will change it to the color of your own bullets. This makes them able to digest yourself and they will bounce off everything else.
I just now added some rough AI to the second player if you are solo to add a little more fun.
Thank you for the feedback and your time!