Of course I don't need all Unity features to make GUI, but I'll spend less time to make it and result will be better. GUI in Glamour is not ideal, but I like it more then any RenPy game.
You like the GUI in Glamour more than any Ren'Py game? Really?
So it's better than Sakura Dungeon's GUI? I don't think so. And, to be honest, Sakura Dungeon could have used some help in the GUI department. And how's that save GUI in Glamour?
And you'll spend less time to make a better GUI for a VN in Unity? Sorry, man, but you're uniformed here. The best VN Unity engine, VNGINE, isn't as good as Ren'Py, nor is its GUI better than Milfy City's (picking the best sandbox Ren'Py game). You want to change the GUI in a Ren'Py game and you
Glamour, as I've said before, is a web browser. It's not rocket science, and could be implemented in a better way using Ren'Py, GUI and all.