its open source but the repo is incredibly outdated, ill have it updated eventually
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maybe, i wrote an article on the game that explores some of the inner workings here - https://nerdyteachers.com/PICO-8/Pico-View/?issue=14#superworldofgoo
https://www.lexaloffle.com/bbs/?tid=142393 it can be found here by clicking on the tiny cart button on the game window
sorry for the late response, here - https://www.lexaloffle.com/bbs/?tid=142393
this is admittedly a tech demo through and through. the project switched engines and this is what the project was half-way through development, before all of it was scrapped
the new version will use a separate custom 3d engine, now with support for polygons and complex environments, you may see this new version of REM in the near or distant future
it basically is open source, although not very conveniently
i made this mod in UndertaleModTool, so if you open the data.win file in UndertaleModTool, you will see exactly what i worked with
im responsible for a modding channel in the downwell discord though, which includes the docs i made for getting started
the docs include tutorials for making a style and new items!