Quite a fun game! I really enjoyed the narration and the subtle jumping hint in the first level. Also how you made it impossible to stack things to jump so I wouldn't go down the wrong way.
I found the third level quite hard I think you could have had one more level inbetween that and the second.
Also the mouse with camera controls left a little weird, maybe Q and E to rotate as an alternate option?
Overall really good entry and really great job. The criticism I had is quite nit picky.