I'm a huge fan! I'm really enjoying this and I'm excited to see what comes in the future. All things considered it works really well and feels AMAZING to play.
My main issue was that with the OpenVR stuff SteamVR kept starting every time I wanted to start the .exe so I ended up just uninstalling it temporarily. If there's a way to fix that easily, I'd love to see it implemented.
I definitely agree with some of the feedback from other comments, I think a small audio cue on a ball pickup and a color change for the ball speed could make things feel a lot nicer.
Definitely something I'm suggesting to friends, it feels really nice to play through the demo levels and try to make different shots.