For game development? I imagine having to use only structs but not classes would be something that forces a "non idiomatic D" experience. Dynamic arrays sound like something that's very useful for a game. I don't know, there are plenty of features that are incompatible with better C that makes D, D. Generally speaking, garbage collection would be the biggest in my opinion.

You can still use classes in BetterC - you just have to allocate them yourself. D recently acquired "placement new" which makes that more convenient.

Yeah this person is asking how to make the smallest executable. They don’t want garbage collection.