Pretty good game! I enjoy the mechanic of platforms falling down as you go on them, it adds a nice twist to platforming.
The spikes are currently too difficult to see, I didn't even know what killed me until my next run since it blended perfectly into the background. There's also some inconsistency with the respawn behavior of the player. When you die to a blue block you just teleport to the spawnpoint but when you fall down there's also a countdown. The game also really needs some checkpoints, it feels really bad to have to restart from the beginning after you make some progress and can lead to many people rage quitting.
(edit) Just noticed but it also appears your game breaks the jam rules by using colors outside of the given palette