This is a fun game!
Audio: The audio is upbeat, and the swatting/mosquito dying sounds are amusing.
Animation: simple clean background. Mosquitoes have flying animation and facial expression, not just static clipart. Well done.
Gameplay/suggestions: You can click endlessly without consequence, making it easy enough to get a score above 1000. Maybe as a challenge (in regular play or maybe on a difficulty setting) have another bug fly around that shouldn't be swatted and could lower the score. Maybe a bee or a butterfly?
For audio/gameplay improvement, it would be nice to see combos. Kill x number of mosquitoes with one swat results in a higher combo score and a rewarding sound.
Score submission and name registration worked the first time, but subsequent play-throughs show blank name for me, and won't display any player scores. I don't know if that's something on my end.