Really cool game! Love the mechanics and the levels. Especially how you introduced one new mechanic at a time.
Small bug: when you respawn on level 9, the red area doesn't turn your trail off until you exit the red. Doesn't impact gameplay, but I wonder if that would have implications if you made more levels. Should be an easy fix though :) 
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Thank you. It's cool to see you kept playing the game all the way to the end. You are only the second person to beat level 9.
I know about this bug and I know why it happens. I discovered it at the end and wasn't able to fix it because I was so tired and didn't have the energy to keep digging throw my spaghetti code, so I left it in because it didn't affect the game's playability.
If I keep working on the game after the jam, I must rewrite most of the code.