The upcoming arcade game, Alien Breed Impact, developed by Team17, has received an all new demo only available on Steam right now, the demo is a prologue of the full game, and it will allow you to play it through both alone or with a friend in co-op.
The full game will be released on June 3, and will cost you $14.99, that is unless you pre-purchase the game, which will cost you only $13.49.
The game will be released on both PC and PSN, and i expect the same Steam demo to be available on the PSN very soon.