I liked it for what it was given it was within the Simulation theme. The only thing I would change about it is to add background music even if subtle and more sound effects.
The only sounds that happened when clicking on a button or when the ball was bouncing at least that were audible to me at maximum volume on my laptop.
So in brief for future builds in my recommendation and opinion if you plan to continue this:
- Add hover noises to buttons not just clicking sound effects
- Add background music for the menu areas and the tennis match
- maybe even some running/dashing noises, grunting noises from the ref when the ball goes out or scores, and cheering from the spectators when its getting exciting with lots of back and forths to make it more lively.