This is great. I'm not really sure where did the idea of turning an airport into a tower defence game came from, but it totally works. The main menu animation is great, and the tutorial level is genius. It really makes the objectives and controls clear, as well as seamlessly establishing the beggining of the difficulty curve.
Good work with the aesthetics. Taking on the extra challenge of working with 3D for a game jam does deserve recognition. The music loop is sick, I love it. I think that some short audio clues would have been helpful. For example, two sounds indicating when the luggage is picked by machines (for light and heavy luggage, respectively), as well as a third sound to indicate that it was picked by someone instead of one of your machines. That kind of thing. Other than that, the camera movement did feel at times a little bit odd.
Great work, overall. Congratulations!