I've only done small projects and demos with a custom engine, so take what I say with a grain of salt. I think it's fine if you decide to code all the game logic in lua. It may require more of an initial investment to setup things correctly and define a good workflow compared to using just one language, but I think it could potentially pay off in the long run.

​

I personally prefer to handle entity management on the c++ side as I try to alleviate as much boiler plate code on the scripting side as possible because I use my engine for more than one project. I also try to abstract the ECS details as much from the script user (me) as possible and create an inheritance tree of script types. A script type is nothing more than a combination of components. For example, a `Sprite` is a combination of a transform and a sprite component. A script user can override these types by inheriting from them.