this game is based from http://docs.godotengine.org/en/2.1/learning/step_by_step/simple_2d_game.html but using godot3 with score and music!
you can download it here -> https://github.com/indmind/pong/releases linux only, for windows, you can compile it yourself
Main music : https://www.dl-sounds.com/royalty-free/off-limits/
Pad hit : https://www.freesoundeffects.com/free-track/tennisserve-468944/