wasd for player 1, arrow keys for 2 s and down is attack you can double jump do NOT touch the hearts.
So basically, me and my brother were bored of killing each other over and over again, so we modified this game for boss fights and 3 player (for our sister), and later on ended up with this garbage. Have fun waiting for 25 seconds for a dumb timer to start your end! :) thanks @remembernovember