Catshade: I Can't Hold My Breath Forever

chautemoc: Edit: Oddworld, Myst/Uru, Another World, Psychonauts, Sanitarium, Feeble Files, Syberia, Longest Journey. Hopefully you like adventure games. ;)

xaemar: Zeno Clash and Rez seems just a bit too action oriented tough.

Mentalepsy: It depends on where you draw the line between "artsy / experimental" and "pretentious." There are also many games that aren't especially groundbreaking in gameplay, but which put a lot of effort into developing an atmosphere.
Here are a few short freeware oddities that I enjoyed:
Illegal Communication - buried at the bottom of the Games page. A weird little abstract side-scroller where most of the gameplay is figuring out what you're actually doing.
Don't Look Back - a brief platformer that I found very affecting, inspired by Greek myth.
All Of Our Friends Are Dead - a bizarre run-and-gun shooter that's pretty much like playing somebody's nightmare.

xaemar: For the pretentious, I don't know why people can call a game pretentious when they aren't in the mind of the people who made the game... The Path, for example, is very often called pretentious, but in my opinion, they just seem to have fun making the game and didn't intend to make the masterpiece of the millenium.

Mentalepsy: Don't Look Back - a brief platformer that I found very affecting, inspired by Greek myth.

Mentalepsy: All Of Our Friends Are Dead - a bizarre run-and-gun shooter that's pretty much like playing somebody's nightmare.

Rohan15: How is that game in terms of gameplay and replayability?

lowyhong: Not too bad. The tower challenges are worth replaying.