Just discovered this jam 2 days ago. So much inspiring games here! (/*º*\) And so little time to get something done! (/ºAº)/
Me, myself, I'm keeping things simple. I'll work based on this case:
I'm making an action arcade game. The goal is to rotate the Landolt Circles (or optotypes) so that they match in the same column, thus winning points. The optotypes travel across the screen, getting bigger and bigger (just like the picture). If one of the optotypes escapes, it's game over! But it keeps getting faster and faster!
You can follow the development in my blog: http://bluejackalopegames.tumblr.com/
I'm a newbie programmer (just a few months of practice with Unity3D), and I lack any sound/music skills, so any help regarding sfx would be appreciated! ^-^