I personally like Chysallid-Humans. Their harmless until you blast their skin off our they do it themselves,just watching them walk around is fun. The first time I shot one of the skins off, the alien was on my ship,half my men got bit,and I almost snapped my keyboard in half.
Well,the games alright. I got it for five dollars new. The grapics are so so. The camera veiw is like grand theft auto, and its got some sweet weapons.Overall, I say buy it if its under 10 dollars,screw it if its not.