I enjoyed the concept, love a good puzzle. It was pretty short, but of course, that's not really a negative with a game jam. Overall a strong entry! I only had two issues with it.
1. SUPER quiet. I could just barely hear it.
2. I messed up on the fourth level, and the game just froze. I had to refresh my browser to play again. A loss screen with an option to retry/restart would be appreciated.