The rule is very unclear. 2 different clues in same row or column are confusing since it's unclear which clue is for what.
And there's no indicator showing if player has filled a row or column correctly or not .
You should give very simple puzzle at first showing game's rules. Start with two grids with one clue then two grids with 2 clues then 2x2 with 2 clues and so on.