An attempt to create Pong game only on the Pixel\Fragment shader at Global Game Jam 2018 .
Ended up with semi basic working version – was a good learning experience.
The code was written inside the ShaderToy web environment and can be accessed and played in this link.

Key lessons for the next time :
1.Better not calculate on the draw buffer.
2.I can perform a lookup of a single texel within a texture.