If you like indie-style horror-type rpg-ish games,
Ib is really really good! I love everything about it. The puzzles are fun, the characters are great, and the art is unique and captivating. Also it's free!
If you're willing to spend ~30 or 40 bucks, Endless Space is fun fun fun!! It's on steam! It's kinda like Civ5, a colonization/empire building game, with competitive online. (if you buy this hmu on steam and i'll totes play w/ u)
Magicite is a roguelike game (also on steam) with pretty pixels and glowy things. You craft tools to gather resources and survive in a multitude of different randomized cave complexes, attempting to reach the end stage (of which is extremely hard, I hear. I haven't gotten past the 4th cave LOL).
Those are a few I've been hooked on recently!