Dungeon Defenders: First Wave - an Unreal Engine tower defense game with RPG elements - debuted on iOS last week, but in two days Android users can get their fill of cel-shaded co-op combat.
The only caveat: your Android device must have 512MB of RAM, 400MB of storage memory, and an 800Mhz CPU. That rules my phone out, but luckily the PC version - which lands next year with the Xbox Live Arcade version - will have cross-platform play with Android. So I won't be completely left out.
On December 23rd, give yourself an early Christmas (late Hannukah) present with Dungeon Defenders!