X-Facing jumps feels very awkward.
The ceiling makes this jump deceivingly hard, and also most of the slimes are useless. The slime would need to be change or adjusted to accommodate the ceiling.
Change this to a wooden button and explain the jump better.
This checkpoint is short, but has some more difficult jumps, maybe adjust some of these.
Nerf the distance for these jumps.
Nerf this turn here (it's been suggested to add glass panes.)