Not a bad little game. I like the little puzzles. The writing was enjoyable too. I found the camera a little challenging at times and the jumping was a little too floaty.
If you're going to work on it more, I'd suggest lifting the camera higher. I found the lighting a little harsh, but I think thats the style you were going for. I'd suggest perhaps have some dark areas and some light areas to contrast with.
With a bit more work and some more innovative puzzles, I could see this becoming a saleable game.