I really wanted the player to be able to 'summon' help, so I invented the Good Turret. It's not that great as a helper, but you do get three of them per pack! One of the saddest features of the game is the (remarkably easy) ability to permanently trap yourself using Turrets. I thought of making it possible to walk through them, but I felt it would be more fun if you could use them as roadblocks as well as weapons. When they are destroyed, their explosion can take out badguys.