Here is the game I made for LD21, in 14 hours. It painfully needs balance and gameplay tweaking which I will be adding later. Also, it is made in Unity, but I won't tell if you don't. :-)http://www.ludumdare.com/compo/ludum-dare-21/?action=preview&uid=531
The premise is that you are a spirit in a temple and you're trying to keep an adventurer from getting killed. You can create rainbow walls in front of him which he will avoid, but otherwise he just runs forward like an idiot - whether it's into treasure or lava. You also use your walls to block arrow shooters, enclosing walls of death, and the like.
I will be redoing all the level design and tweaking gameplay in the next week or two if you want to wait for it to be playable. I myself have only beaten it twice, it's incredibly difficult as-is. I basically spent the last 30 minutes dragging assets into the scene until I had what I deemed a large enough level. I didn't even have time to playtest it before I submitted.
Such a bad time to have so many things scheduled over the weekend...