You’re right, this is a bit if a nothingburger game, but it’s also a concept I’ve not seen before, which considering how basic the concept is, is an impressive achievement of creativity! A kind of ‘turn based snake-em-up by the numbers’ thing that could be expanded upon quite easily.
Maybe make it so missing a number gives a -10 score, or reduces the number of newly placed tiles, instead of ending the game outright, just to keep the fun going a little longer. You could also add in pickups that increase the numbers on placed tiles, or maybe expand the board over time as your score increases. Even put a ‘rival’ on the board if you’re feeling bold. Lots of stuff you could do with it.
While it may be a ‘corporate feeling nothingburger’, well… so is Tetris, if you think about it.