After months of work we've finally put the game into playtest over at Microsofts App Hub. Any of you with an account for XNA Premium can check it out and let us know what you like and what you'd like us to change/fix! If all goes well and we get enough feedback we'll be releasing it on XBLIG soon after.
We're also working on the PC version and looking at implementing achievements and leaderboards so hopefully it won't be far off either!