Three hitpoints and no checkpoints is pretty brutal, but nonetheless:
The amount of content here is impressive, but I think it came at the expense of refinement. The motion sickness that others have reported might be because the camera follows the player's Y position so rigidly, coupled with how quick the jump is. I've seen some games alleviate it by having the camera's Y position stick relative to the last point where the player was grounded, as long as the player stays within a certain boundary.
Nonetheless, I had fun with this! The music is nice and jaunty, and it was satisfying to beat each level given how exact you had to be.