So I like the concept of it, because doing some good old Halloween matching is always a fun thing to do this time of year. The main screen design was cool and the fun lasted...for a very short time. I think there are some major improvements that can be done, though. For instance, as others have said, it needs some sound. Some fun little Halloween music in the background would be cool as well. I really think the best thing you could do is extend the game play. Instead of just letting them retry, give them levels that has more rows and more cards. Maybe even add something where they can only make 5 mistakes (or something like that).
For what it's worth, it was fun while it lasted. I'll give it a 2.5.