okay
The game is basically okay, I couldn't really detect any flaws gameplay-wise, but its graphic design isn't that great.
1. Use a different font, the one you are currently using is unreadable
2. If you have found a matching pair, maybe let them fade out instead of removing them as soon as they are tuned around.
3. the game itself is pretty simple (not in difficulty, but in design). Maybe you could add different modes; e.g. A mode in which there is only one pair, the rest singles. Maybe add a difficulty choice.
You could make a timed mode in which you give the player extra time for each pair he makes, so that there is a little pressure. Let him go through increasingly difficult levels.
short: it's okay, but you could have made much more of it.