Hi, first suggestion is a mute button because the beeps are a little too loud to be blasted constantly. A softer sound for the ball drop would be better, however a mute button should be a standard for your game if not sound controls.
Edit: A couple of bug reports, the wavy lines on the multiplier box began to stick with a bendy form as I moved it around and got balls stuck in it's box.
Also the fireball inside the main box can be unglued and pushed out of the box after shoving balls around and taking them in so much after a bit.