Thanks for your feedback! To the not responsive input, please describe it a bit closer so I can fix it, I don't really know in which way.
About the level design, thank you, gonna do that.
For the collision bug, I didn't notice it so far but I'll see how I fix it.
Making the camera following the player is an easy fix, as well as the checkpoint. It will be included in the new version I'm just about to publish.
