Super Hexagon is a minimal action game by Terry Cavanagh, with music by Chipzel.
This game has been out for awhile now and I saw no thread on it so might as well make a note of it since it's an interesting game. The PC port has just been released and it's on Steam. It's also on iOS and Android.
The objective is simple: Avoid death as the little triangle plagued by lines forming the hexagon to which you're bound to. It looks simple at first glance, but once you actually play the game it's a whole different story. Prices are the same on all ports, but it's interesting enough to warrant a try. Be prepared to die a lot. If that isn't your kind of thing, I recommend not playing this. I've beaten the first level, and if you can do that, then the 2nd and 3rd levels are essentially a cinch.
Here's the creator of the game clearing the hardest level(Starts at 0:12):
[Video: https://www.youtube.com/watch?v=JJ96olZr8DE]