I kept automatically jumping at the end of platforms to avoid falling off, intending to double back like you could in any other game. Note to self: THAT DOESN'T WORK.
This is really nice!! I appreciated the level switching because focusing on one level didn't frustrate me into quitting, and it also helped me figure out the controls and do better at the levels I was having trouble with. It really gives you that sweet serotonin when you finally beat a tough level. I'd love to see a full version of this!