The game is absolutely awesome! Will definitely follow this closely.
Couple small comments I'd like to make, though.
It would be perhaps interesting to tweak the strength of the towing cable in mission 7, the box has a tendency to catch on corners and it can be a bit frustrating having the cable snap constantly. I suppose it wouldn't be much of an issue if it is a gimmick confined to this mission, but I believe it should be modified slightly if this becomes a recurring mechanic.
What's more, it would be nice if more of the environment was destructible through collision, or if it was destroyed quicker, mainly the smaller and mid sized trees as well as the crates stacks in mission 7
Having said that, I find this game truly great, I love the addition of multiple types of environment!
Cheers