Your Daily Stupid: XenoSpace
If the hyper-death Shank trailer and attendant mention of the Zombie/Alien Shooter series has whetted your appetite for absurd violence, perhaps this small, browser-based chunk of cheerful monster-shredding idiocy will do the trick. It's called XenoSpace Survivor, it's a lot like Alien Shooter, and there's very, very little to it. But there is a beyond-wanton level of alien-death, plenty of guns and OTT power-ups, and even some scientist-shepherding action to pretend you're doing something worthwhile amidst all that cartoon gore. It is Quite Fun, and it may be played here. It would be Extra Fun if it had mouse support - cursors and spacebar only, alas.