Nice Game, It's very relaxing and there is so much attention to small details. I like the art style, maybe things like the brick walls could use normal maps to have them feel less flat when in direct sunlight, but that is nitpicking at this point (it's more something to try for late polishing). I noticed the one tree in forest level 3 was cut off, but I guess you'd have fixed it if you had the time left. Besides those minor visual things, I didn't notice anything off. The sounds were great and the music fitting and relaxing. It was fun to play and the puzzles were good introductions to the mechanics. I am interested how difficult the puzzles would get in a final version of this game, as these were still very easy (as they should be for introduction puzzles). It's a very atmospheric game, and I like that.
All in all, it's well-made with interesting concepts, and I'd be interested to see where you'll take this game after the Game jam is over. If the next mechanics are as good and thought out as the ones you have right now, this will be an amazing game.
(I took so long writing this that I reached the end of the ambient bird sounds, perhaps put those ambient sounds on loop, just in case. Also, surrounding yourself with two boxes prevents you from jumping, it's nothing game breaking, but a minor inconvenience. The ladder in the final unfinished level lets you climb through the ground)
Had a lot of fun playing this and wish you a great future in game development