GET SWOLE

[Gors]

I suggest outiling tiles and objects in the Metroid mockup different from BG black so it can stand out more

The rocks in the background should probably be darker to blend in more, and the tiles themselves could use something to draw them out more but I don't know about the objects, I think they're bright enough to pop out compared to the background. If I had to fix it to pop them out more I might go with a lighter desaturated/low constrast background.

the colors in the tiles look fine, i'm talking about their outlines. having it completely black makes it hard to know the tile's boundary. GBA Metroid, for example, had a light brown outline for rocks, i think it would work pretty well in your mockup