As a game developer I can recommend to use Lua. This language is tradtionally used in many games/game engines.
Ironically, one of D's declared selling points is, according to https://dlang.org/overview.html:
Who is D For?Programmers who write half their application in scripting languages the other half in native langauges to speed up the bottlenecks. D has productivity features that make using such hybrid approaches unnecessary.
