btw there's a pretty major exploit you can do where you can just not move the dropper, and keep hitting down, and all the bubbles just stack on top of each other infinitely without causing a game over. also as a side note to that, you cannot merge 2 of the largest size bubbles to get rid of them (like in suika game), so eventually, playing normally, you will run out of room.
attached picture is after about 10 hours of leaving the game on overnight with a macro hitting down