Prices for Impact are as follows, depending on region:
UK - £12.99
Steam Euro zone 1 - €14.99
Steam Euro zone 2 - €11.25
US - $14.99
Here's a trailer to wet your appetite for alien face shooting:
We're the bearers of good news, and to prove that, we're here to inform you that you can now team up with a friend and play co-operatively via Steam. Surely there's nothing better than filling one of those slimy aliens full of holes with a friend.