OBL: One Button Left is a simple game I wrote years ago. While it is not more than a simple hunt for the highscore, the controls are smooth and the difficulty builds up fast, so some people actually like it!

Although it is written in Java 1.5, it probably runs best on windows - fullscreen mode and audio output do not always work properly on other systems.

If you have trouble: There is a flash version (http://www.mochigames.com/games/obl-one-button-left/) of the game that is missing fullscreen mode and the sound track, but has a global highscore table.