Looks really good! I'm editing the sprites also... ...but I don't think posting a public key of the sprites would be allowed. All of the mario maker clones with different sprites have been taken down.
There is no key. When SmileBasic starts up, set the game's folder you're editing to the active project. Next, click on Create Programs with SmileBasic, and tap DIRECT on the touch screen. There will be a smiley face button. Click on it then.