I recommend the Picotron, their newest fantasy software. It is a full fantasy workstation. It has no upper limit on game size and can export native binaries for the big three OSes. You could, in theory, publish a full game with it.
You can boot it up, fullscreen it and totally LARP programming... I guess an amiga with nicer color pallettes?
https://www.lexaloffle.com/bbs/?pid=166998#p strawberry_src is a fun editor to use for all of this
also all the recent 3D work is seriously impressive considering picotron has quite limited "fantasy hardware"