I do like this idea of a game, needing to fill in squares and keep increasing, while trying to think how to get the highest score as possible. and only managed to get up to over 3000 points.
though there are some things that could be nice to have, a 'game over' sequence would be useful, appearing if you go under the points or at least when you ran out of cards.
Overall, a good experience with good replayability values.