The idea of a universal platform sounds very interesting.

For example, there could be something like the Godot/O3DE game engine, which is specialized in the development of wargames / strategy games.

But the question is how universal such a platform should look like:

Do you have to be able to ...

<t> It looks like that many people have the same problem, it would be nice if Slitherine/Matrix do a little communication about it!<br/>
I tried it with different credit cards, different computers and different browsers. Always the same error message for weeks! <br/>
I had no problem with buying ...