This is pretty cool - I downloaded it, installed it, played it, was impressed, and promptly died.  I gotta get used to the controls but they guys that worked on this (Dobermann, Chainsaw, et al) did a fantastic job...looks like lots of fun and it's very well done.

If you're a fan of the original XBox Halo (by Bungie), you gotta check out this Halo side scroller called HaloZero.