I got this error after completing the first level (Arch Linux and Love 11.4)
Error invalid key to 'next' Traceback [love "callbacks.lua"]:228: in function 'handler' [C]: in function '(for generator)' toybox/entities/Room.lua:435: in function '__update_instances' toybox/entities/Room.lua:48: in function 'oll' soul/court.lua:307: in function '__step' toybox/entities/Game.lua:54: in function '__step' toybox/LGML.lua:229: in function 'update' [love "callbacks.lua"]:162: in function <[love "callbacks.lua"]:144> [C]: in function 'xpcall'
I'm sorry but I'm not going to rate it because it just crashed and I just barely tested it.