The UnderGarden, then some new DLC may excite you. Available right now on the Xbox Live Marketplace is The Ludwig Pack, named after an esteemed editor on this very site.*
Coughing up 160 MS Points ($2) for The Ludwig Pack will net players two additional levels to explore and some -- oh, wait, that's it? Yeah, that's the entirety of the DLC. Snoop around in our gallery below for some screens.
*Okay, we made that up, but how cool would that have been? So cool!