its a gun that shoots lasers which are green (they make light) are pretty fast, slow down the robots and go through enemies and add blaster bots too. Upgraded lasers could have a green fire which would also slow down the robot. You could also choose to charge or just shoot a laser. OR EVEN MAKE THE ROBOT GET ZOMBIFIED SO HE FIGHTS FOR YOU AND GETS CARRIED AWAY BY THE GARBAGE BOT AT THE END OF THE ROUND (FINAL UPGRADE). ALSO SLOWING UPGRADES