my language, gecho

I just wrote a language in C, and would love it if anyone took a chance to take a look and give some feedback. Positive or negative is fine, but i'd prefer constructive negative feedback. Maybe suggestions for improvement, or a new feature?

Thanks!

if it doesn't have at least one of the following features, it's shit:
1) lexical closures with garbage collection
2) multimethods
3) homoiconicity
4) tail recursion optimization