One of the best Transporter type games I've played
The physics of the truck are exceptionally good - it moves like I would expect a truck to move and I can react accordingly to make it work within it's environment.
The obstacles are varied, colorful, appropriate, and ultimately get quite challenging which I find refreshing - not the same old hils and holes you see in other similiar games.
I took a point off for lack of instructions - only those who have played these types of games can initially understand the mechanics.
One observation is that the challenge bar gets way too high at the end - I couldn't make it past level 8 without losing all my cargo - or (this happened the most) I would get stuck on an obstacle. These levels in my opinion are for advanced/expert players - maybe you should categorize them in some way - easy - medium - hard - expert?