I really like this game although I wish there was a more extensive one player version. The online version is nice, but I'd rather see this turned into a campaign game where you can select different characters and fight different scenarios.
Good game. Needs a paude button, and the boss is way toooo easy. I usually don't say that, but the boss was pretty simple. I'd like to see some unique upgrades in here, something really fun like a jetpack or a freeze ray, then you could up the difficulty on the levels, too.