Feels like a boring, Fragger clone.
First I thought this was an actual shooter game, but no.
Doctor with his "gun". The gun is a cannon, misleading and telling people that you are going to play a shooter game.
Maps make no sense what so ever. Floating platforms with zombies, gravestones, torches and coffins.
There is no actual story. You are just a doctor with a cannon, on an UFO shooting zombies with shots that turn them to humans for some reason.
Not much to say.