I loved this! When I saw the theme "Dome" this game idea was the first thing I thought of. I think you chose a great art style and chose a fantastic way to implement 1 button. Really fun game loop!
I agree with the other commentor; the visual of the row of bugs is cool, but I'd like to see an actual number. Did I kill 15? 25? It was hard to tell. Giving some sort of score to the number of bugs would really make this a fantastic 1-button arcade game.