I usually steer clear of any game containing words like "Awesome" (OSSOM) in their titles, bur since this was a recommendation from Terry's blog I figured "what the hell".
You have a ship, controlled by the mouse (i.e. you point somewhere, it goes there) and fire guns at ships and stationary targets. That's it. What's really worth a mention is the really cool PEW-PEW-PEW-PEW-PEW first weapon you have - I just can't get enough of it :). (oh well, the LAZOR you can buy later on is pretty cool too!)
I finished the game quick enough, but kept feeling it needed some more tuning up, I'm not sure how though.