I am looking for help adding some details to my game.

[BloodserGames]

Oh so it's SMM smb1 based?!
also which ones have been improved, as almost all of these have a background (or in one case foreground) that makes me want to scream in terror.

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Are you really sure this is what you want? The 8-bit SMB style is very simple, I don't know how you're going to draw these detailed environments in this style. Usually the game only has two tiles for the level, a flat color background and some scenery like hills and trees or none.

Also the only BG I don't think I could make in this style is the soulsand desert, but I'll probably figure something out

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Are you really sure this is what you want? The 8-bit SMB style is very simple, I don't know how you're going to draw these detailed environments in this style. Usually the game only has two tiles for the level, a flat color background and some scenery like hills and trees or none.

Also the only BG I don't think I could make in this style is the soulsand desert, but I'll probably figure something out

Hahaha if it's based on the Super Mario Maker, I thought you knew it haha, I'm a fool sorry for not telling you. And I did not understand that part well, are some of my foregrounds that are in these screenshots bad? The one in the second screenshot I have to change that yes.

https://bloodsergames.itch.io/super-mario-bros-lost-land
  click to play my Game!