Wow, very good work, congrats. It's beautiful and enjoyable.
I'd love to see my progress, though. A score, or a progress bar, whatever. Something telling me that I can "win" or at least know if I did better than the last time.
Also, when the game ends, there are 1 or 2 bugs... not sure about the display of killed bugs?! And the sound is not reset properly, during the 2nd game I hear a disturbing buzzing sound.
Still a really great game, thanks!