i found a glitch, if you go real fast, the balls will not load fast enough. and if you shoot at max power to your left, you will noitce there are 0 balls. dont now if it only for me, but there is no balls if you shoot left at the start of the game.
same I experienced exactly that.
The dev didn't add map generation just random ball generation in an invisible box around the map. If you keep going right you will experience the same thing.