This is honestly probably the most correct interpretation of the theme :)
Some suggestions for implementing a sudoku game:
- Instead of red lines for each 3x3 box, use much thicker black lines. This is the standard in sudoku and makes boxes much easier to discern. This is especially necessary since changing the resolution can change the thickness of some of the other black lines, which really messes with how you see the 3x3 boxes.
- You have to make sure that your generated puzzle doesn't have multiple solutions so that each puzzle can be solved properly.
- As others mentioned, the ability to add notes to cells is a must.