It's very cute, relaxing and fun, though I wish there was an easy way to look at previously completed charms
Right, I saw that after posting the comment, as well as the bonus puzzles. The game seems to struggle a lot at rendering 15x15 grids, leading to a lot of dropped inputs. Perhaps consider not updating tiles that can't be interacted with anymore? If that's even possible, I don't know how it's coded backstage. Also, it would have been way easier to keep track of which row/column the square my mouse was on if the corresponding labels on the left/top had been highlighted, just like the tile.
Anyhow, I played through it in an evening with a friend and we had a blast. Thank you for making it!