P1: O and P to turn, I to change projectile, left and right arrow keys to move, space key to shoot. Projectiles explode. Blue projectiles bounce infinite times off the edge, and red projectiles create a larger explosion. Green projectiles shoot straight. P2: Q qnd E to turn, Z to change projectile, A and D to move. S to shoot.
Based off of my older shooting engine, http://scratch.mit.edu/projects/42141374/
