Thanks for the comment!
I actually tweaked the time a lot. And because the main goal of the game is to make 5x5 blocks (like clearing 4lines in tetris). My friends which tested the game didn't like shorter time, so i stuck with 5mins. But later if i do a full game out of this i would give the option to choose the time.
P.S. Sure it's like tetris but i doesn't try to mimick it's sense of urgency, instead i'm encouraging players to move in a rhythmic pace, so urgency won't help that!