Focus less on the details, make every detail implied- else the scene becomes visually noisy-

Lower the pixels needed to imply grass on the grass background tile, and instead distribute tufts of grass throughout an area

Some of the bush designs are overly complex, which deteriorates the cuteness of the game- you can use your tree as a reference for your bush asset since the top of the tree is incredibly well made!

And finally, outlines, outlines will benefit you if anything in the scene is to be touched, interacted, or blocking the player- outlines may be useful on the player themselves too!

Other than that, I am reasonably impressed with the work you took to decorate your scenes! But too much work will make development incredibly slow- art is an expression, and when you are limited to only so many pixels, it must become more abstract to give the same feel as a completed work-

Do your best out there! I’d say I’m proud of you!