Please show clipping and objects floating, and colors changing.
Why does he need to make his models from scratch? They're based on store assets, but highly customized. Just look at the problems people had on the fan art thread trying to get the girls right.
But really, the big problem with your statements - "Why use an extremely limited engine like Ren'Py instead of unity or something with more customization."
That just shows your ignorance. Ren'Py is based on Python. You can do just about anything with it - with the possible exception of a real time 3d game. Not to mention the Midnight Paradise Unity debacle - MP was Unity, it sucked, and LewdLab switched it to Ren'Py. Much better now. Contrary to what you seem to be saying, Unity is not automatically better than Ren'Py. And if you don't think you can make something besides a linear VN with Ren'Py, check out Sakura Dungeon. It's a traditional dungeon crawler, with quests, exploration, fighting and items - written 100% in Ren'Py.
Trust me - I'm a "coder"!