I've put a puzzle game I created a few years ago onto Steam Greenlight.
http://steamcommunity.com/sharedfiles/filedetails/?id=817410272
I'm currently working on something new and mindbending, like Recursed, but that won't be ready for a few months. In the meantime, I thought it might be good to add this older project with the view to releasing it as a budget title with some Steam integration features.
Puzzle One is a permutation puzzle sandbox that's quite difficult and quite addictive. If you like Rubik's cubes or other twisty puzzles, you will enjoy it. Please check it out.