sometimes when a block falls from above the top, combos of 4 break as combos of 3, also i had 6 hearts on top of each other, the line below broke and 2 blocks from the line above fell down and i didn't get the other line .___. that all happens during long combos
4/5 if it's gonna be a hard grind the game itself better be polished :P also you never need to use more than 1 duck except for 1 side race, so that team stuff doesn't even need to be there