you might be interested in embedded Schemes. I use s7, which shares a lot of features with both CL and Clojure (for a Scheme) and is very easy to embed in C or C++ apps. I use it for music coding, but others (e.g. Naughty Dog) have done it for games. It's a super fun way to develop. My high level code is mostly Scheme, interfacing with low level C.