I really like the visual atmosphere and the sound design! The way the paddle makes a noise when you move it feels really good.
A bug I encountered: I got to the worm level and he shot the ball out. When it hit the paddle, the collision seemed to bug out with the ball rapidly bouncing up and down on the paddle without going back up to the rest of the level. Eventually I let the ball fall off the paddle to reset. But when I launched the ball again, it did the same thing, only this time it got stuck on the screen's top wall. Very mysterious.
And then a design observation. Sometimes the ball bounces at a really shallow angle and you spend 30 seconds watching it bounce left and right before it comes back to you and it kills the momentum of the game.