I can see the effort you have put in into this game and it's real solid one. In my opinion it kinda does not match the theme of the Jam, I just can't see going deeper anywhere. Would change how the ball bounce too, especially on 45° walls, for better game flow and experience ball should go up instead of bouncing back on the 45° I use this physics in my similar game to yours and it works just fine! Anyway I really liked the game but the theme is a miss.