I have a feeling it's selling to the crowd who bought Silent Hill 2 back in the day. There hasn't been anything that has matched up to that game in a long time, and this looks like the same sort of thing, without the horror stuff. It comes up in comparisons often, also.
A game I'm developing with some friends:
www.xnagg.com/zombieasteroids/publish.htm
It is largely a technical exercise but feedback is appreciated.