I really like this particular type of puzzle, and it isn't nearly as easy to find as sudoku, so I'm happy to see a game like this be made. I like the presentation of this game, the art and music feel right. Also, the checkmark on columns and rows that have had their requirements reached is a really nice touch that saves on time recounting.
However, there are some puzzles that have multiple solutions, but the game will only take one answer, especially in the earlier levels.