Thanks for the feedback.
Nice idea about the Roll button, like this people could click on it when there are ready before the timeout.
The goal of the game is to build something on top of the trailer and at the end of the countdown we expect to have less fall blocks that the limit example (you have 4 fall blocks at the end and the max is 7, you win the game).
The rotation is mostly for triangle blocks. on a square is just rotate the face.