I tried a few mini-LDs a while ago and they went pretty rough.  I’ve worked hard since then though practicing and getting much more familiar with my tools.

I’ll enter the JAM and maybe if I get it done early I’ll submit as a contest entry.  Do the rules allow that?

My big stumbling block is generating content.  I’m starting with that first this time around.  I think I’ll sketch out a very simple game concept and then just blast into painting and playing around with music melodies.

Anyway, C++, Codeblocks/Mingw32, probably using Open Frameworks and GLFW.  Maybe some Box2D.

EDIT: I’ll need to use some Portaudio and Ogg/Vorbis library code for audio playback and mixing.  Link to the code is here