The art, music, and parallax background of a moonlit night fading into day make up a complete and unified experience. It feels moody in a good way.
Seconding others comments that a grace period of "coyote time," so that a moment after you walk off a ledge you can still jump, would make the game a lot more accessible. I think the game is more difficult than a mood piece needs to be to get implemented; the lack of Coyote Time was most of the reason I didn't try to find the secrets in the clouds.
Also suggest a score counter with number of carrots found vs number of carrots in the level.