Oh yeah, all these engines are capable of making good looking games. They're just images of 3D models with painted on shadows and lighting. I did the same thing with the RPG Maker back in 2012 too.
I decided to change the name of the game while i was working on its last patch. Grave Prosperity was always just a way for me to test the limits of these smaller engines, but once i found C2 i realized that I could actually make something decent with the resources i had. So i made Grave Prosperity Redux, put it on Steam and used it as a way to measure what people really like in my work, and what people don't like. Once i got all the feedback i needed i started working on a massive patch that was meant to fix all the most commonly complained about issues, while building upon the most commonly enjoyed features. While i was working on it i started thinking about how Grave Prosperity had a really fractured background with all of its different builds and known issues, and i really didn't expect the patch would be enough to save the title due to its history. So i decided to drop the name all together and make City of Amber out of it. It's a title with no negative prior background, and it's being made to appeal to its audiance with the best of its predecessor's features, and none of its flaws. Seems like a win win so far.