Nice! Cool simple concept, fun timewaster. I really liked the letter keys becoming arrow keys suddenly, because I totally wasn't expecting it. I'd love to see that taken even further, suddenly snapping to the mouse or something crazy as the controller would be cool, or even using key combos that aren't in traditional WASD formation.
I also didn't really like how sometimes my controls would snap change in midair above an enemy, kinda felt like a scenario where there wasn't anything I could have done differently to not die in those situations. Maybe if there was some kind of visual feedback to indicate that my controls are about to change, or what they're about to change to, it could be a cool microgame of managing and preparing when it was safe to make dangerous plays like jumping over enemies.