For our first LD we decided to keep it simple and make a parallex scrolling race game in which you (for a good reason, mind you!) have to get 10 silver medals (10 seconds, heh).
The game might have 10s intervals too, in the form of checkpoints or something but that remains to be seen.
Still a lot to do so back to work it is! Good luck and have fun you all!

Also, for some reason I really like the visuals of your screenshot.