Love the campaign mode, hate the challenges. I'm just going to ignore the challenges badge because it sucks. The badge has nothing to do with the quality of the game. 5/5.
I agree with the badge difficulty being changed to impossible. This game is very difficult and time consuming; one bad move and you lose, with no save points. 2/5.
Well made game. After learning how to play on the first runthrough, I restarted. If you conserve ammo and use the pistol as much as possible (it works well on everything but cloaked guys), you have a ton of money for the last level. good difficulty badge. 4/5.