I had a problem with the level where you have to turn the car around. Any time I would press F the car would be ether dropped back to the box or placed unturned. Maybe it's only on laptop? I will try it on my desktop later.
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Had a go on desktop and no such problem. It really was my laptops touch pad. I think it might interpret me pressing any button on the keyboard as releasing the mouse button for some reason.
Now that I actually finished it I would like to commend you for making such generous box collision physics. Positioning them a little under a platform pushes them back and I don't have to restart!