http://armorgames.com/play/4413/the-infection Kinda like a HL 2d game. Pretty fun.
Tips
1.Use your melee weapon on EVERYTHING except humans(when they are far and not shooting at you...) and lesser aliens(headcrab like things)
2.Only use your gun on greater aliens(anything that doesn't look like a headcrab...) or use to snipe humans
3.When you get to the giant head boss, the one in the watery...er...blood flooded level. Use a gun to shoot it when its eyes are opens, and melee humans it drops
4.Stay on the ledge on final boss level
5.Shoot the final boss in the top eye to damage it, and when its dead, melee all the remaining humans/aliens at the bottom
How long can you survive in survival mode?
I survived 162 seconds with ONLY melee weapon...
p.s. you get a lightsaber in survival mode after you beat the game :D
