Crashing bug on actual Playdate hardware:
In world 4, there are platforms that move when you shake your playdate. If you stand on one of those platforms, then shake the playdate, the platform will move out from underneath you. This will kill you and then crash the game. Crashing also triggers the "next" level unlock bug mentioned above.
As another piece of feedback, the crank inputs are too sensitive in this game. It is difficult to move a crank platform just one tile.
Otherwise, I'm digging it so far!