A fun game with a good engine, that falls short.
Immediately what comes to mind when I play this is that the engine is very good, you can hit the ball from many angles and this makes it very effective, sadly this came features many problems that take any a lot of the potential enjoyment.
1: The CPU is insanely difficult to beat, near impossible to defeat, slow it down a little perhaps? Or:
2: The small playing field, where each side of the playing field is so narrow, the ball bounces back too soon, this makes it too easy for either person to get the back ball, MAKE THIS WIDER, for the love of god.
3: The arrow at the top of the screen indicating the balls position is nowhere near as useful as it should be, the arrow is too small and unnoticeable especially since it overlaps scores. If you wanted to make it much more effective, it should be larged by default, point towards the ball (down to the ball when below, up to the ball when offscreen above) and get larger/small depending on the distance from the ball/arrow, this makes things a lot fairer.
If you could fix these problems the game would be SO much better, they shouldn't even be that hard to fix since the game is so simplistic as it is.