Playing two boards simultaneously is an interesting idea, kind of like fusion mode in Puyo Puyo Tetris. Though the game feel could be made better with the usual tetris stuff (like counterclockwise rotations, DAS/ARR, wall kicks etc.) but also the entry delay is a bit too long for me. I understand that you wanted to wait for the boards to get balanced, but I feel like that takes away from the possible high speed play you could get out of this game. The way you have to press left/right for every piece to choose the board also feels a little clunky, I would prefer something like pressing tab to change the board whenever I want and then that could affect the next piece that will spawn. (You could highlight the active board and darken the other one for clarity.) In any case, a cool take on a classic, great work!