Eversion

Bloody Hell, this game was hard. But fun. But hard. But… wow, it fucked my brain up good and proper. It’s like Braid, but with parallel universes instead of time puzzles. Short, sweet and, if you’re alright playing a “lo-res” version, absolutely free (although an HD version is on Steam for shy of a fiver).

I can’t say any more about this game without spoiling the experience. You just… you need to play it.