This was a decent game, but not that good. I think it's mostly because it's a bit too repetitive. I woudl have also liked it if there weren't so many enemies to kill. You do, however, manage to get some cool things to use like the tank. I mean, who wouldn't want to use a tank? The music also seems quite fitting.
For something about Doomsday, I would have expected bigger explosions and more weapons. You know, a machine gun or something. You could have also capitalized some of the words. Doomsday just seems like a word that needs to be capitalized.