This is a really creative concept! The truck controls and the physics are super fluid, and the movement of the camera is really nice too; I like how the camera slowly moves ahead of the player when accelerating. I think the angle of the camera is pretty disorienting, though, especially when trying to enter a tube that is facing away from the camera perspective. The visual and audio design is also fantastic; I love how the audio is muffled when driving through a tube.
I did find it a little challenging to know where to go; the blinking lights weren't very noticeable to me. On the third level, the map was so open that I really had no clue where to go for each delivery; and it was difficult to learn where to go when on a short timer. I thought the second level was really clever, though! The central tube made it clear where to drive to, and kept the challenge of the level focused on the traffic jam aspect of the game. And, of course, the helium jump is just awesome.
Great game!