Well you were originally supposed to save the egg but......now you try and kill the egg as many times as possible. Yeah. I know it doesn't follow the theme. But it's not really a game so kinda the least of my concerns. Anyway.
Controls: a, d - left / right w/space - jump s - drop through platform + fast fall shift - drop through platform arrow keys - directional attacks
Hit near the center of the egg for a sweet spot to deal more damage and knockback.
Missed that it was a COMPO game. Woops.