Very retro, very playable and very, very fun!  Take a trip back in time with this terrific tennis game.  I only wish it had 2-player mode but with 4 difficulty levels you should find the level that matches your skill.  Full controller support is a nice bonus here and most definitely you should make use if it, although the keyboard controls work well enough if you don't have a controller available.

Available at https://jonasmumm.itch.io/ace-tennis

As for myself. I think the highest difficulty level was a step too far...!