there is a problem. if you click 1 monkey on monkey choice and pick second monkey, you place 2 monkeys at same time. you can't cancel your choice while choosing monkeys. you can only sell them after placing. but game is very great! It's a very good recreation of btd6. good job!
and 1 thing too. you should add x2 speed mode, because with game's lags it is so slow and getting through hard on took me like half hour or more