To combine weapons, first spawn the two (or three) you want to combine. Then, remember the keys that shoot them. Push one of the weapons on the other, and most likely they'll combine together. I made a zero-gravity sniper with a Flamethrower and a sniper rifle.
I think there should be a single-player Campaign, where the evil Cat Doctor Professor General steals all the world's cheese and scatters it in random places across the world. Your job is to collect all 100,000 cheese and harness the power of the cheese to use a Shaman-like ability so you can create a level to capture the Cat Doctor Professor General in the last level. + this if you like this idea.
 "Papa's Taco Mia!"){kind=icon}
 "Mutilate-a-doll"){kind=icon}
 "Santa Can Fly"){kind=icon}
 "Transformice"){kind=icon}
 "Depict1"){kind=icon}
 "Chaos Faction 2"){kind=icon}
 "Dead Drunk 1.1"){kind=icon}
 "Toss the Turtle"){kind=icon}
 "Drop Dead: Final Cut"){kind=icon}
 "UPGRADE COMPLETE!"){kind=icon}
 "GeoSketch"){kind=icon}
 "You are a..."){kind=icon}