Too glitchy.
It's a good concept, except it's way too glitchy. I know you want to make a hard game, but hard should not mean glitches.
1) Even though the plane was flat, if the ball landed between platforms, the angle will change.
2) If the ball falls down toward the edge of the green platform, it'll automatically curve and fall off the platform.
3) The physics of the ball was off.