This is an absolutely crazy amount of levels for a 3 day jam, I have no idea how you managed to do this! There's a really good amount of mechanics to keep things fresh through the levels and some of the levels have a nice bit of challenge to them! I managed to get through all of them and the interactive credits screen at the end is a nice touch! Awesome choice of music and I dig the art style.
Some things I think that could be improved are: the animations for the car could be a lot more pronounced, some squash and stretch while it moves and jumps or maybe having the antenna wave in the wind would be nice. A sign telling you that you can drag the boxes on the first level they appear. I wish I could've used the arrow keys instead of WASD for movement, it felt kinda awkward to use my left hand to move the character.
Overall tho, this is a really awesome jam entry. Great job!!