The game is way too hard as it is because the boxes are too light, just their mass and you'll have something really good. Good job on the models though!

After a couple of tries switching to using a controller did help with the controls. My potato laptop did cause issues with the physics with one update causing the boxes to fly everywhere (it did give me a bit of fun trying to catch one in the truck). Overall a good looking fun game, going to give it another go after work to get more than 1 box.

Nice concept and overall feel, extremely challenging though, after many attempts I couldn't finish with more than two. Great considering the time limit, however it would've been nicer to make the controls smoother. If I hadn't already lost the top boxes, I would lose them on the bumps. Overall a cool concept and game, but it was a little too hard.

I liked it! the concept was good but I  found the game neigh impossible, I could never make it past the first two obstacles without losing every single box, still its pretty good. 
(note as typing this comment at the end I accidentally put a semi Colin, I've been program so much I think I'm going insane)

This is quite a challenging game. It's perfect for the theme, smoother controls would have been nice but it's hard to do a lot of polish in 3 hours.

Fun idea, I noticed the game is much easier with a controller, where moving gently is possible. Couldn't finish with more than 2 boxes, but is it even possible? Sometimes the boxes flew away even when driving straight because of the bumps on the road. :O