Apparently somebody played Last Stand 2 and thought, "what a great game. It's a shame it ends when you win it! What if I made something exactly the same, except you couldn't win and the enemies were aliens and inexplicable scorpions? Bingo, perfect game!"
I think the makers got a little too stoked on the ragdoll physics. In places it really detracts from the game (i.e. when you're trying to do anything but look cool when dying). Like Sponge said, fine movements are impossible, which kinda makes it hard to add the finesse that seems to be so important to the challenges.
 "me and the key")
 "GlueFO 2.0")
 "The Foyle")
 "Endless Zombie Rampage 2")
 "The Last Canopy"){kind=icon}
 "Kongai")
 "intrusion")