Okay? The concept is fantastic I love it, I really wish I had the time/motivation to do something like that myself.
Sadly this is made by the Newest team which is equally to Ghost Games in terms of real developer studios. I won't go on all the logical mistakes in terms of astronomy (because logic is out of place in Mario games).

Just looking at the raw hack, I can see very fast that it's basically a ROM hack with good HD graphics taken from the board and completely pixelated backgrounds brought in by yourself (or actually only one own background which is more pixels than background as seen in the trailer).

Also very disappointing to see a completely normal standard castle in that trailer. Feels very out of place.

All in all I still don't trust you guys to actually do something good by yourselves but maybe you can finally show that you are able to do more than just stealing other peoples work and claim it as your own.