I honestly struggled to play this on my computer at first because the resolution is too big, my computer itself is not 1080p, had to use a tv as monitor and even then it was a bit too big to show everything at once (maybe due to be playing on the browser and not fullscreen)
I only noticed that the pieces at the bottom can be hit on the second level, when there are targets near them... and that and the third level are when the theme really starts applying.
I really liked the sound effects when the targets are hit though, I found them funny. And the background music was nice.