Awesome platformer!
The jumping/physics feel really good, the animation is nice and fluid, graphics are simple but fit well, and the checkpoints are very much appreciated.
I like the self-harm mechanic that takes away health if you use the wrong keys but not sure it’s used to the fullest; all it seems to do is restart you from the checkpoint. Maybe if you lost all your health from pressing the wrong keys, you’d start back from the beginning (or previous checkpoint) instead of the current checkpoint?
Other thing I noticed is that the collision areas on the corners of the platforms are angled so you end up sliding down them if you’re stuck there. I can appreciate the intentional difficulty of that but it’s unfair if the keys change while you’re on the corner and you can’t move until it’s done swapping.
Great job overall!