Press z key to change head sprite and press x key to change body sprite. If you want to use this, just ask and give credit (I don't know WHY you would want to use this, but I am interested in what you would use it for non the less).
Hey! This is me in the Undertale style for my AU Some Regular Tale. I just have plain old Megalovania in the background so no custom track YET. If you want to make a track for this by all means do. Just ask me and I will allow you to do so (although I highly doubt anyone will). Megalovania by Toby Fox