I have played it before and the PSP and the controls and gameplay are identical, which is a good thing.
The game is huge and they give you a great number of sample levels in the demo. I've two very small critisums though, 1st the sound isn't a clear as it should be for DD5.1, it sounds like the just ripped the PSP ones and didn't change a thing. Secondly, the game looks great in HD, but strangly there are a few place where you have jaggies, considering this game isn't very demanding at all on the 360, I was just suprised that they couldn't be smoothed out.
On the plus side the game is huge, there are 220 levels which should keep you going for days and days, it increadible addictive and certainly one of the best titles on XBLA at the moment.
So while I have two very minor gripes, this game is a must have if you haven't played it already on the PSP.