This game is broken. If you fall, you keep falling and the only way to reset is to refresh the browser. This doesn't seem to be anything spectacular. Just your basic 3D hop and bop platformer, but if you do some more testing, bug fixing, and a few other refinements, you might have something pretty decent here.
Reviews for "City of Grey"
The hitboxing feels a litttle off. I got killed by objects that I had already passed a couple of times.
Some of the jumps are also incredibly frustrating since the double jump only seems to work when it feels like it.
Also, you should probably make the obstacles reset when you die so that the correct way to get past them is same every time.