Ceilless

As with most puzzle games, Ceilless is simple to describe on its face. The objective is to guide special boxes into a series of crystals. Once every box is locked in place, the entrance to the next level opens up. To accomplish this, the player is given the ability to rotate the entire level, thus using gravity (and a little clever mid-air maneuvering) to hit the target. Objects with other attributes start to appear as the game advances, and the levels are overall quite varied. The best point in this game's favor is the flexibility involved. Many of the levels are open-ended enough that there's more than one potential solution. As long as you don't trap yourself, you can find a way to finish, even if the solution is a little messier than the one the designer had in mind.