+ Cute. The characters, art, and story all fit together.
+ Chill music. Also fits with the rest, but deserves extra mention.
+ Good puzzles. Nothing to complain here. The challenge is good unless you've done a ton of these puzzles.
- UI could use some work. Marking squares sometimes doesn't register if you click or drag a line too fast. If you try to load a save while on a board it registers a click on the confirm window. Clicking a square you've marked with a cross creates a mistake, which means one purpose of marking with crosses, guarding against misclicks, doesn't work.
- I prefer getting rid of mistakes and instead allow erasing and not telling you if you've marked a wrong square and not auto-marking a complete line/row.