Some tiles and enemies used -
https://www.spriters-resource.com/custom_edited/mariocustoms/sheet/69705/
Tiles that I edited for use on level 2, 4 and 7 -
https://ansimuz.itch.io/sunnyland-forest
Songs -
https://freesound.org
The principal characters, menus, backgrounds, code and etc was made by me and, I'm sorry but, I don't want to share it. At least for now.
There's a lot of tutorials online that you can learn about pixel art and script, if you want.
Thks for comment and sry for any gramatical error.