Fun game with cute Penguins. Felt a little sorry having to exterminate them :) Weapons are fun and quite satisfying to fire which is pretty key for this game type. Starting off with the basic gun there was a nice sense of panic at seeing a Penguin and turning around to see one coming at you. Little bit more relaxed when the bug guns came out.
You have done a really nice job putting this game together and a lot of work it seems has gone into it with the weapons and the procedural level. A few variations in the penguins and a mini map would add a lot. But a great fun shooter.