My entry into the 48-hour Ludum Dare game development competition. The theme was 'Minimalism' and my game is a one-button Gameboy-style platformer featuring 24 levels, multiple enemies and obstacles, and Super Meat Boy-style action replays.
This was made in Actionscript using the Flixel library with additional supporting code from Photonstorm's Flixel Power Tools and Axcho's FlxTilemapPlus
You can play the finished entry here: http://www.ludumdare.com/compo/ludum-dare-26/?action=preview&uid=11139