Had multiple people report this mod to be as crashing their game with the following error:

Error Message:
ERROR 3451305841/mod.lua:261: Attempt to index global variable 'obj' (a nil value)

You copied the player step script but there's a variable "obj" used in that script that only works within the context of the original player lua file, but not if you take it out of that context.

Changing "obj" to "self" on that line so that it refers to the player object should fix the issue.