I like the concept of the game, it is very minimalist and it probably could be expanded to be even better! I like that the text is written with circles, but the actual UI panel around it is a rectangle. I'd love to see the ball get faster over time, and perhaps adjust the pentagon movement slightly because once the mouse is turned fully to the right of the pentagon it seemed to mess up the rotation of it, even if you'd release the mouse button and start from the middle with the drag again. perhaps resetting the movement after releasing would be beneficial? Unless this is already a thing and I missed something.
The sound really fits the game!