Unfortunately the game didn't recognize when I got a 4x4 and I experienced the stated lack of timer working and desync of background and foreground. But apart from that the concept of collecting tetronimoes in a rush was very fun! Got kinda stuck when my 4x4 didn't clear... If I could add one thing apart from fixing those bugs it would be a pentomino mode which has a wider grid, requires 5x5, and uses pentominoes. I liked what I could do though!