Well done with the ping pong. Imho the music fits really good to the game which makes you wanna win (even if you play against yourself :-P).
May you wanna add some more stuff after the jam to the game. So I would add another sound effect when the ball enteres a goal and I really would add a menu where you can regulate the volume sound.
I've also noticed that the ball always bumps away in 45°. Usually the input-angle == ouput-angle which would make the game more dynamic.
While writing I get a tons of ideas for you ^^. So let me write bullet points:
- The ball is getting faster over time
- Add Items: Player could collect to get additional points, temporary speed, angle change or so
- Add Single-Player
- By adding an AI
- By adding a Wall (here I would say it is important that the ball is getting faster to create a challange. Also you could track the time to create some motivation for replaying this mode)
- Add Highscore
Overall really well done. This is a nice pong game :-)