Very well executed in visuals and especially audio. While the main gameplay is simple pong, its energy boost mechanic makes things a bit interesting by necessitating losing for speed boosts and softens the blow of losing a goal a little. The game even accounts for awkward scenarios when the ball gets stuck between the paddle and the wall.
While several have commented on the difficulty, my main issue is time. It takes 10 seconds after each goal before play is resumed. While it's realistic and part of the main appeal, eventually it stops being fun and drastically interrupts the pace. In theory, a perfect match would take 3.5 minutes plus the time it takes to score goals. But given that no match can be perfect, my times inflated (lol) to over 5 minutes per match. I think I wouldn't mind the difficulty as much if I could play way more rapidly.
If anything, I'm very much looking forward what may come in the future. Given the great polish in the game and how receptive feedback appears to be taken, I think future games will be even better.