Played until level 18. Really great idea!
I feel the difficulty progression could be smoother, I didn’t feel there was any increase at all even with more numbers. Perhaps if you have a solver it can grade the puzzles?
And there could be a way to add a little something extra in there, like moving dots.
I’d also appreciate being able to go from 0 to 9, and do away with the reset altogether, would be much less annoying.