Hi! I know this is your second game and the concept is great!
I just made my account to say that there is (what I assume to be) a bug.
You can place checkpoints down in the air, and when you spawn from a checkpoint, You can jump again. This means if you're quick enough, you can chain checkpoints infinitely and skip the platforming aspect.
Again, I know it's your second game and I couldn't do better! Sorry if I sound condescending.