You may want to consider using Lua for game scripting. It's a lot more strongly influenced by Scheme than e.g. Python, and has been designed from day one to be

You may want to consider using Lua for game scripting. It's a lot more strongly influenced by Scheme than e.g. Python, and has been designed from day one to be embedded as a scripting language for existing C/C++ projects. It's quite mature, widely used in the game industry, and has been in production use for over fifteen years.