I played your game for the first 13 levels. To be brutally honest; the 2d environment really does not play nicely. I would've really wanted an undo button. Or the ability to deselect the item I am holding. Dragging to place multiple items etc. That being said, the 3d environment works really well, I love the feel of the movement, and the different items you can place work well.
Finally, I dislike the levels. The amount of items youre given is really generous, and that makes the 2d stage more of an exercise of patience than a real challenge. Level 12 was also more of a parkour challenge. I would've much preferred 10 thoroughly thought out levels (though I know full well how hard it is to design a good level (pain))
Please don't take this comment too negatively, overall I actually had some fun with your game. By self-imposing some restrictions on what items to use I had a good time, and I think you also know that having fun is anything but a given when trying out jam games. Well done!