I had fun with this, it's very polished and neat. Starts very easy but the difficulty feels like it scales up well enough.
If there is one thing i could wish for, it would be to have color coded numbers on the field. I (like many players) rely on the color of numbers and not literally reading the numbers when playing sweeper likes, and having only white numbers is just noise to my eyes, it's a bit too straining. Even if it's just an accessibility setting and opt in, it would be so very nice.