For Player 1: w-a-s-d for movement, space to shoot For Player 2: arrows for movement, 0 to shoot
To keep the mechanics easily visible, you can see a red outline around the map. The red outline, when collided with, reverses the Y velocity of the bullets, where the plain blue level reverses the X velocity of the bullets. The collisions aren't as seamless as in the platforming templates I created, as I wanted to keep it (relatively) uncluttered.