You will need to install a user script manager extension to install this script.
Let me just preface this by saying: I do not, and never will, condone the usage of cheats/mods that add a competitive advantage to the battlefield of shell shockers.io. The development and overall purpose of this script/mod was purely to prove that it could be done(proof of concept) for shell shockers.io. This script is only to be used in private lobbies of shell shockers, or not at all.
With that being said, here I present a fully functionally toggleable ESP/Extrasensory perception mod (Aka "wall hack") for private lobbies of shell shockers.io.