Comic Quest. A charming and funny turn-based RPG by Double Fine on XBLA/PSN. You play as a little kid trying to rescue his/her twin sibling on Halloween, all the while wearing a costume, completing quests and collecting candy. The battles can be different depending on the Halloween costume you're currently wearing.

Loving this game, continues to make me laugh out loud and it's just such a pleasure to play. I mean, it's not really challenging (so far) but it's so damned enjoyable. The combat does get a little samey but you hardly notice.

Grab the demo on XBLA if you get the chance.