shoot'em up
it has quite a catch, because once u started playing u can't let go, why I don't know(I'll let u figure it out)
the bosses are quite easy, until u reach the ending, it can be quite enoying because the last boss is real hard to defeat considering the fact that "it" can summon lots of alien hoardes, but if u have a good weapon and armour, and some health packs it takes about 15 minutes to defeat him(u make verry little damage)
and it has a funny and comic way of splatering all the alien guts on the floor, and wall....and when I saw the way my character looks in the power armour, just like a bear with a plasma minigun in his hands, I started laughing.
what can I say more, just play, save us from the invading aliens, and u will be pleased