If you're interested in arty games that push the boundaries of what games are doing, you may be interested in Dear Esther, which will be released on Valentine's Day of this year (much sooner than The Witness will be!)
The trailer has just been released:
This will be the second Indie Fund game to release. Just a few days ago we announced that Q.U.B.E., the first funded game, is already a financial success. It appears obvious that Dear Esther will be as well.