WOOOW. Holy fricking shipploads. This looks totally amazing!!
Can I make one suggestion please? It looks like you have changed the Samus character graphics sprites. This is fine but in my personal experience with another Metroid hack called Metroid Origin (one of the best Metroid hacks ever made), they had changed the jumping/spinning mechanics of the Samus graphics sprites and it looked terrible every time Samus jumped and spinned in my opinion.
The original fast vanilla spinning is way better than the custom Origin graphics in my opinion and so I do make a point to play Origin without any of the custom Samus graphics solely to avoid the bad jump/spin graphics. I think the original Samus sprites are just fine and I absolutely want to avoid any bad spinning sprite graphics that make the character look like Samus is inside of a spin dryer .
So have you edited the jump/spin graphics as well?
If you have I would suggest to leave the Samus sprites as they are in vanilla Metroid and please don't do anything like the Metroid Origin hack authors have done with the jump/spin graphics because that looks terrible.
Thanks for your consideration!