Gnomic Studios has released Square Heroes Beta for free ahead of their release in October for testing.
Square Heroes is a hilarious comic arena shooter featuring Online, LAN, Co-op and local multi-player gameplay, a single-player Tournament and an arsenal of weapons to blast your friends out of the sky!
Get it, tell all your friends about it and play the heck out of it with them. Of course being a Beta release, there may well be problems. Please report anything odd you see (or any awesome ideas you have) to the Beta Feedback discussion.
Beta Download Links
Linux and Windows on Desura (Linux version tested on SteamOS and Ubuntu - includes all dependencies)