Cool very solid game! Nice graphics and the music was picked very well, however, I would make sure it loops properly. It is not so nice to the ear when the music stops and starts again. I did not get exactly why you can rotate the blocks. Additionally I would also introduce a button where you can trigger the "Roll" on your own as soon as you are ready. I was also not 100 % sure what the goal is. It just said "7 max" for easy, where I was unsure if it means that I need 7 blocks on the truck or if it is the number of blocks I do not need to stack.
Still a very cool game and nice polished implementation! Congratulations.