You are a square, a 20x20px square to be exact. Jump your way through the levels without hitting anything. "One Square at a Time" is an open-source arcade game and is similar to the flash game "Space is Key" by Chris Jeff. It is programmed in Python2.7 using pygame, therefore it should be easy to port to lots of other operating systems, but I can't test that at the moment, since I'm doing the work on my desktop Linux PC.
Build 10052011 Released 10th May 2011. Includes source code of the first build.
This is the source code which you can use under the license of GPLv3. This is nowhere near complete, but I thought I'd might as well share my current progress.
This build is very limited since it's the first one, but making maps and adding more levels works fine. Just mess around with 1.map.
Please read README, LICENSE and INSTALL.