Great idea with the confined area on a moving platform.
Nice art style and music/SFX to go with it.
The tutorial mode could do some some improvement, to walk you through it a bit more. It told me to WASD to move, and when i did i died, then i got to the platform and the game started, so i didn't know what I was doing for a while as the tutorial kept cutting out. Finaly realised i had to stay still and press spacebar to get through and read it all.
Possibly could do with a bit of health for the player, rather then one hit death. Especially with some of the difficulty early on. Especially in Jam games, ease the player into it with some easier first levels, and ramp it up.
The game however is really nice, a great jam game entry. Well done!