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Reflective shield which reflects all projectiles back at enemies so you can walk through the complex while hostiles murder themselves.
Shooting proton cannons should create water as a product of chemical reactions.
Or did he scurry around in an environment suit the entire time?
Let your drones enter exits and explore next floors.
Since there are double slot items, why not have half slot items? Processors would be good candidates.
Introduce the notion of front, back, left and right and add rotation movement. This would allow directional effects like directional vision, sensors, armors, shields and so on.