Retro Evolved 2 is a shockingly good sequel. The only problem is the lack of an online multiplayer mode. Everything else on display here is a drastic improvement over the original. Every new mode is extremely fun to play and requires a totally different play style to master. The geoms put upgrading fully in your hands; you have to decide if you want to risk your life for a couple of green gems or if you want to focus on staying alive.
Even little tweaks--such as including your closest friend's highest score in the upper right corner of your screen to constantly give you a new goal to strive for--raise the addiction level. At only 800 MS points ($10), this is not only a great value but also one of the best games on XBLA.