I just wanted to refine the projectile code, so I focused on that. The "bullets" have a limited range, are affected by gravity, and are destroyed if they fall below the floor level. If they come into contact with the enemy, the bullet is destoryed, a particle system is played, and vectors are used to ensure the particles point in the correct direction. No more than four enemies are spawned, and power ups are spawned in random time intervals, but there can never be more than one at a time. Quite a fun little project though!