Those aren't realy custom. More like edits. Samething with the over worlds, just edits. They're a bit plain too, maybe you should add something. Like the cape in the one sprite
You really haven't done much other than recolor and in some cases a minor edit here and there. I suggest that you set the sprites individually, or, preferably, place ALL the sprites of the same theme together, and make an impressive sprite sheet. Keep it up.