A game based in the shoot 'em up genre that features multiple bosses and a material-switching mechanic to avoid the enemy's attacks. If you and the enemy are the same material, you can't hit the enemy, and the enemy can't hit you. Change materials at the appropriate time in order to successfully dodge the enemy's bullets and get hits on the enemy. Use the arrow keys to move, 'z' to shoot, 'x' to change materials, and shift for focus movement.
Note: In order to start a new game when you die, you have to relauch the program.