Still hoping I will have time to do the jam. My intention is to make a game in the Yarnspin engine, which I made a couple of months ago, so just thought I'd post it here before the jam starts.
http://www.mattiasgustavsson.com/temp/microengine/...
There is no documentation yet, but there is a sample game and full source code is included (and the code is public domain, so free to use for all).