so, I got it for @ $ 12 a little bit back. It's a pretty decent knockoff of L4D w/ aliens.
It has it's good points & some minor small annoyances. Needs a few tweaks here & there on weapons/ sounds/ voiceovers and a bit of the gameplay oddities.
I think the characters aren't fleshed out enough nor unique to stand out much...
It's fun enough by your self or with others and worth the $12 , not sure about the full $ 30 unless they finally released all the maps/ campaigns today.
I hope they open it up to user made campaigns/ mods and it might actually get some long legs to it and become even better.