So this is my Jam entry for LD 49 called Stompin' Grounds:

https://ldjam.com/events/ludum-dare/49/title-tba (I wish I could change the URL though :D)

Rollin’ over unstable ground... can you dodge the shockwaves and reach the end without falling down?

It's a short marble game you can play in your browser or download for WIN, MAC and Linux.

Unfortunately it has no sound and the level design needs quite a bit of work but I'm glad I finished on time and actually made a playable game with a beginning, an ending and even checkpoints ;)

Enjoy!