I really liked this game. My only complaint is that the walls are too sticky. You really don't need to buy anything (at all). Only thing I ever bought was bombs for bosses (not that any of them pose any sort of challenge). The helicopter is insanely abusable by spamming the button rather than holding it, especially for the spider boss.
there is a problem with the catapult, it wont crank. it says to hold a button and to release to throw (like the slingshot) but it barely cranks then auto fires every time.
I don't know why, but this game is incredibly choppy, and my computer isn't bad. I can play far more demanding games than this, however this just doesn't want to run well.
I don't see the purpose. all you need is one room of each type of person, then spam workers and researchers. there is no challenge, nothing preventing you from winning.
this game makes no sense. cannon is called catapult. fine that's excusable. but what is with the retarded paths? look at level 3 if you don't know what I'm talking about.
really good game, though rather short. good music too. Auto aim was nice, made it easier to dodge bullets. Snake is a rather OP though. I got his skills maxed and I would just stand inside the boss. too easy.