Looking up the word 'indie', it sounds like MARDEK is an indie game, so there's that. Other than MARDEK, VVVVVV is the only game that I can think of right now, and probably the only 'traditionally' indie one. Or something.
Antichamber definitely sounds interesting though, I'll probably try it at some point.
Detail-wise, I guess I like VVVVVV because it's one of the few games that I feel really evokes an actiony fast-paced adrenaline awesome amazing wheeee spirit well. Like, really well. In particular, 'The Tower' I replayed over and over and over and over and over and over and over and over and over and over and over because it was just so *fun*, it's one of those games where you die a lot (I died a total of over 2,000 times), but death is so utterly temporary that it practically didn't happen at all. The graphics really fit the game it's picturing, the pretty colors combine with flashy shiny thingys, the absolutely amazing soundrack, and the fast-paced nature of the game to create an instant cure for boredom, sameyness, monotony, cancer, stupidity, depression, and not having epileptic seizures. It's name is really a pain to pronounce though.