Don't know how it is on a PC with mouse control, but on the android version with touch controls the Maris feeding minigame seems to break if you press anywhere but the fish. I understand that you are supposed to drag and drop fish from the right side of the screen to Maris, but if you click anywhere else, the drag and drop functionality stops working, and you have to exit and enter the minigame to reset it to a working state. I don't think it needs explaining that on smaller devices, the size of the fish icons makes them surprisingly easy to miss, which in turn makes the probability of running into this bug quite high.