Looks like some of the UI elements are smaller in your browser, but otherwise looks playable! I'm guessing your browser size is above 100%? Just tested this myself and found they don't scale to your browser size. This would be a quick fix; thanks for helping me find a bug!
Glad you enjoyed the star effects! I put each star there by hand, so if you reach higher levels you may see some pretty cool patterns. Just see what happens after level 100 ;)