Too many ads
As everyone else has said, it’s kind of a buggy mess and seemingly a cash grab by the developer by trying to put as many ads as possible into it. It’s okay if you are playing it for a quick bit of money on a website like Freecash, but once you get past about level 12, the “ad break” ads become pretty infuriatingly frequent. I also noticed several bugs: the option to turn off the vibration does nothing, on the main menu the shop button does nothing, and several times I had to force close and reopen the app because it gave me a blank board when I went to a new level.