First and foremost, in the author's comments page it should say 2 to use medkit...
Now that that's out of the way, it's just a standard point and shoot. Nothing really bad about it, the enviornments look ago and the difficulty doesn't become completly insane right away, it goes at the right pace, so it's a pretty cool game. Plus, the controls are simple, a big plus if your like me and HATE using the keyboard for a controller.