This was a pretty challenging action platformer, although I'm one of those wasd movement guys, so I struggled until finally plugged in a controller and everything immediately clicked. One small change I would suggest to alter some of the difficulty is your iframe situation. I think giving the player more invulnerability time between getting hit would be nice. Right now if something lands on me I take a million damage in 2 seconds. Definitely a fun game though and loved the music and game progression.