hi I was wondering if there's any engine we have to use? ie unreal, Unity, Godot, or VN speific engine. I was looking through the FAQ and couldn't find it, thank you in advance.
There are no engine restrictions for general participation.
To be eligible for the Best Light.VN submission and best NaniNovel submission, you do have to use those specific engines, otherwise you're welcome to use whatever engine at your disposal.