Love the atmosphere, and (our game was our first foray into 3D) respect for anyone that went 3D in the jam. :P
Some points of (hopefully constructive) criticism are mainly that, as others have said, the lighting is a little too dark, and that the controls don't seem to "flip" as you turn upside down? As in, pressing left makes you go the same direction when you're upside-down, unless that was a bug in my play-through. xD