On a related note, here's a Logo interpreter I implemented many years ago using a dialect of Forth: https://github.com/JohnEarnest/Mako/blob/master/demos/Loko/L...
Totally unrelated but you made ok! I learned a ton from it! Both from using from reading the implementation. Thank you so much for it!
(For reference: https://github.com/JohnEarnest/ok)