This game is easy 5/5. It is very polished and well made. The only complaints I had visually were very small like the ball not lining up when they serve. I would have liked to be able to change my controls because I wanted to hit the ball with my right hand and move with left.
Difficulty-wise, I know it's "supposed to be difficult" but those guys are crazy :D I wanted to beat all of the levels but the strategy on the second boss becomes too monotonous. The first guy I was able to just hit back and forth left to right and eat the punish shots. But the second guys punishes were crazy. Which means that I had to just keep pressing S-A-D-S-A-D which made ME sad.
I will have to come try again when I'm not rushing to finish reviewing all the games.
Super great job on this :)