I just found out about this game, its called "I was an atomic mutant!" and its amazingly cool. Its just like the classic 50s b movies and has you as your pick of four monsters (giant woman, godzilla like creature, giant robot, or flying brain with eyes) and each monster has about 5 different attacks and each level you have to destroy a whole town, while avoiding helicopters, atomic bombs, and tanks and the like. Its so fun. check out
http://www.atomicmutant.com/ for screenshots.