I wrote a similar piece of code way back in high school, based on Paul Graham's "The Roots of Lisp" essay. I didn't know any better, so I used C/C++. Don't think I've ever learned more in a single programming project.
Would you choose a different language now that you know better?
If someone told me to hack together a mini-Lisp? Sure, I'd use something different. But at the time I'm happy I used what I did. I learned just as much about C as I did about Lisp.