Nicely done! I have been trying to implement actual usable (as in, they can be used as a scripting language for instance to build anything) languages in as few lines as I can (without making them unreadable). Ofcourse that's more as a challenge than anything serious, but it is fun. A minimal implementation I define as being something that can parse the language, interpret it and has FFI to add whatever else you may need. So far I got down to around 50 lines in C# [0].

0. https://gist.github.com/tluyben/16ee2645c4c8aed813005d51488d...