To kill a Gray: throw a grenade at it. To kill a Void Eater: throw a grenade at it. To kill a horror: throw a grenade at it. To kill a Grinder: throw a grenade at it. Hope this helps.
Very good, but the levels could, and should be longer, enemies should leave screen when level is beaten, and maybe a commander to tell you waht to do rofl.
3/5 fawr naw.
http://www.synchysi.com/.music/Dream%20Theater/Octavarium/01.%20The%20Root%20of%20All%20Evil.mp3
33 million on it because the song is glitched and plays double.