Thank you for your answer! ^_^
Ah, that's curious about RPGMaker! I do wonder what it is that causes it to violate the rules... But no matter!
As to what engine I'm contemplating, I primarily use Panda3D for my development (link: https://www.panda3d.org/), and had it in mind to build a "light VN framework" with it that I could use for this jam.