I wanted to learn how to use raymarching and distance fields to render 3D scenes like all the cool kids in the demoscene, and figured that I could do it in real-time at 64x64. I also wanted to try the new multipass features of Shadertoy.
Although there were some compatibility problems with WebGL on some computers that I'm only now ironing out, I think it was basically a success!
It's a low-rez space simulator called LAIKA. Play it here, w/ source code available here for the curious.