Nice concept! It plays well I like the nuance of the curved surface creating a bit of unpredictability.
This is just personal preference, but I'd rather the paddle follow the mouse directly instead of being 180 degrees opposite. It felt a little unintuitive, but I know that's just me (like whether or not you like your Y-rotation inverted in FPS games)
But that inverted control actually did make me more engaged and focused while playing!