Armadillo Run

For me, Armadillo Run was the best indie game of 2006.

It's a very simple concept based around a nicely implemented physics engine. The resulting puzzles have a reasonable range of difficulty levels and the internet highscore system is better than most since you can download the actual solution which led to the score in question (which is both entertaining and prevents cheating).

Manifesto should definitely offer it if possible.

Yep... We like the game a lot, too, and in fact, contacted the developers, who said they want to offer it exclusively from their site for now. We'll certainly carry it if/when they change their minds.