The art style, music and ambiance are quite nice.
The first area where you can move it seems like it has a parallax effect, but not the the rest. The effect looks quite nice, was hopping to see it also in the other areas :D
Moving left at the start of the game seems to bug the game. Maybe you may want to put a invisible barrier there to stop triggering a transition and to stop the player for going there. Or to remove or disable the transition trigger while going left in the first area.
The controls might need a bit of an improvement as a platformer. I personally had some issues with them.
- Left / Right controls are responsive and are working nice.
- SPACE / E / F for me were not always registering.
- Placing the box with by clicking always worked, but for some reason while facing left and jumping(SPACE) it would also place the box down. This started around 2 and 3 lamp post.