It was a bit hard to figure out what exactly was happening at the start, but I like your twist on the Game Jam theme! :)
My main two feedbacks regarding improvements are
- I got spawned onto or very close to spikes when the level switched sometimes, which instantly reset me. Maybe you could do some kind of safezones? where you spawn players in, instead of an exact position translation between levels.
- Sometimes its hard to figure out which ground is actually walkable and which is not! Maybe give the hostile ground some kind of glow effect (or other effect) or make the texture for it slightly spiky to indicate that it actually kills you.