I liked the hit to jump mechanic. I got stuck in a couple places because I couldn't get it to strike in the direction I wanted, but the quick "try again" cycle kept me hooked to try over again more times than I care to admit.
I also liked how the level design and enemy placement became a puzzle to solve to get past an area.
The yellow platforms were a bit frustrating and respawning after a death sometimes lead to another death because I was still holding forward when I died and ran right off the platform when I respawned. Maybe some sort of short break either when you die or after a respawn so it can register in your mind that you died?
Good job! Very engaging...