Cool music and art, controls were clean just a few bugs and tips to report
1. Sometimes you would take damage even if you hit an enemies head so maybe make the hit box for that smaller
2. After a few attempts i realized I would occasionally die with one heart left and or a heart would be skipped
3. Randomly double jump sound effects and particles wouldn't go off even when the double jump worked
Fix these, add some more levels and I can definitely see this as a full game
Thanks for the game,
Good luck!