2D or 3D?

The main complaints I see about C++ might just be from the intimidation of the syntax.

But whether you use LUA, C++, Javascript, etc, consider the platform you want to release it on first.

Then the language you use will be easier to choose then.

I use the Maratis3D engine because it uses LUA as a scripting language (easy to understand syntax), and it is easy to use for beginners. It is free to use also. And, if you want to edit the engine itself (in C++) you can, and fork it however you want.

I mainly use it for learning though. Then, from there I could go on to invest in Unity3D.

So just make meaningful, thoughtful, steps towards your goal.