Although there aren't any other sudoku games on GOG lol :D. But anyway, if you like sudoku, you can play this infinitely, because aside from main puzzles of the game, 27 + 12 extra, you have a daily challenge option and a random puzzle option. By finishing main puzzles you unlock a card with a photo and information about a real cat.
And also the game is very easy to get into for people who don't know what sudoku is or even children who can't read, because it doesn't explain itself through text but through the easiest possible puzzles that effectively get anyone to understand what the point of it is without any reading or even knowing numbers, because you're playing with cats instead. You can switch to numbers anytime though, if you get cats mixed up.
Technically the game works smooth and fast, with tight graphics style and pleasant music (although there are only like three music pieces in the game).
Also the game has some real and useful information on handling cats in your house.