The Love Letter is a unique stealth experimental game by Alex Cho Snyder and Pat Kemp, where you must read a note from a secret admirer while dodging the taunts of your classmates. Originally a Ludum Dare entry, The Love Letter is a short bit of sweetness that will have you going "AWWW!" by the end.
dRive is quite possibly the first calculus-themed game to get a review on this site, but don't go fleeing for the high country quite yet; you don't need to understand the math to play the game. At its core, dRive is a simple "catch the falling objects" game, but the unusual, calculus-based method of controlling three games at once turns dRive into an innovative, fascinating game.