I have absolutely enjoyed the experience of playing this game. I'm one of those people who likes mathematical thinking, but who hasn't been in a math class for about a decade, so this is perfect for me because it isn't prohibitively challenging as far as the sort of math you have to actually perform, but it requires you to test things out and think outside of the box as more ways to create numbers become accessible to you in the form of "spells".
There's a charming little plotline with NPCs to provide the story propping up the puzzles, but I'd definitely say this is a puzzles-over-plot game.
If you enjoy logic puzzles and growing a toolbox incrementally, this is a game you should enjoy.