I threw together this tiny drum machine project and am posting it here in case anyone else might be interested. It's not a game, though I've been having a good think through various game ideas surrounding drum sequencing.
<img src="http://www.ugotsta.com/labs/files/2012/03/ugotsta-beat-box-screenshot.png" border="0">
It's just a basic drum sample sequencer similar to early versions of Fruityloops. Drum samples are easily replaceable and the project file makes it relatively simple to add more sounds and tracks.
And that said, here's the capx:
And I've got this posted up at an experimental blog along with a demonstration as follows:
Hope this helps or entertains someone.