Awesome But Easy
This game definitely deserves your attention! Although it is quite easy except for one or two levels (specifically the fight between Tankman and Alien Hominid/Salad Fingers and some of the "Challenge" fights), this game definitely ties with NG Portal Defender as my all-time favorite. The music is sweet, and the graphics are rather good. Almost anybody can pick up the controls in a relatively short time, and it definitely becomes addictive. The short story modes for each character are kind of funny, especially for Tankman. I won't spoil them for you; go see for yourself!