Kind of fun, although the fast trucks start first. I'd suggest dividing the trucks up into sections that are surrounded by boxes, and set the timetolive (check the script menu) of those boxes to certain times. They should delete and the trucks come! Other than that, nice job!
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The gameplay is good, but learn how to use variables. It's not "points", it's "scene.my._points" (global variable, works across the scene) or "_points" (local variable, limited by the object). This is good, but you need to learn how to use variables correctly to enhance the game.
This is just what happens when you set the density of something to 0.01. Objects lighter than that will float, and objects heavier than that will sink. You can actually see this in real life with helium!