So, I found this interesting indi game (via VG cats) called Eversion.
Eversion means something along the lines of turning inside out, and the gameplay is related to that.
I don't want to give away too much, but the gameplay is platformer and puzzle solving based around an environment that you shift in a way similar to light-world/dark-world in some zelda games.
The game's page is here:
http://zarat.us/tra/offline-games/eversion.html
It took me a while to get through a few of the areas(due to my own clumsiness), but the gameplay is fun, and I only regret that there are so few levels to play through.
There is a bad and a good ending, by the way, and the good ending is very... interesting.
I found that too. Having trouble getting the all the gems from the final level.
That game is freaky. I haven't finished it myself--I'm really bad at platformers--but I watched videos on YouTube and love how creepy it gets near the end. So delightfully eerie, I love it, and I usually dislike cosmic horror-type-things.
The Eversion twist is really interesting, too. It's fascinating how they made so many levels and such un-glitchy gameplay in just six or so weeks.