Sometimes I had the feeling, some of the guards were changing between the levels when I was tansiting fast from the crystal level up. Not sure if this is intended?
I would also recommend usind a,d or arrow keys in this, it's too hard to control the paddle. The mouse goes often out of the window and then the control is weird. But good idea with the extra features to the classic breakout game!
I like it. Only at the beginning with the arrows, I think you get stuck for a bit too long, where you can not do anything. Maybe make this waiting time shorter?