But I do see what you mean by using darker colors and such,but your remake isn't so cheery!
I did this by choosing other colors in the 256 palette (I did not alter the palette in any way).
I'm not claiming this to be the best way to reduce saturation or make a cheery scene, but I just want to show that it
can be done without using MS Paint-like colors. I do want to note that the colors I chose are actually much brighter, yet much easier to look at.
I probably should have changed that rock thing, since it stands out now (I didn't think of it.) Oh well. Just use lighter greys since they have absolutely no saturation whatsoever.
Don't just use these tiles and call it done, though, Bloodblade. Actually make an effort to improve them as well as making better color choices.
EDIT: Edited some of my post.