I had said that I was thinking about trying other engines as well. The reason for this was the sudden and unexpected change in Unity's pricing policy, which would have killed YRPG Builder immediately.
Here are the first experiences and results I made in two weeks with the Unreal Engine.
I created a small prototype to a game core, which allows to create dynamic RPGs similar to YRPG Builder and that without programming knowledge (or here blueprint building knowledge).