Ok I've played it a little bit more in search of bugs and things that I think could be modified for a better experience, and these are the 2 main things.
1. When you complete a level, and press z without any new move on the next level, the score goes negative and the puzzle becomes impossible because it pastes the pattern from the previous level.
2. This is the easiest example of the "correct configuration" not working I was talking about:
The solution the game accepts: 1) 5a-3c, 2) 3a-1c
Another valid solution that the game does not accept: 1) 3a-1c, 2) 5a-3c
I don't know if this is a problem that only I get, because I've been playing other embedded games for this jam, and things don't work only for me for some reason.