This is pretty good, but there are a few points of improvement
- Embedding a Youtube video into the page introduces lag. I understand why you did this, to give people an idea of how the game looks/plays before they play it, but a link to a URL may have been the better choice.
- The paddle seems to move too fast. You barely tap that arrow and it's extra zoomy - when I just want to move a tiny distance but it instead zips all over.
- This game might do better with mouse, rather than keyboard, controls. It would definitely help with better precision movement.
- Bonus points if you incorporate gamepad joystick controls into this. That would probably be the most natural way to play it, with the circle of the joystick corresponding to the circle in the game.