Just remix the level (give credit to those who deserve it) and make new levels in the sprite "Ground" and new backgrounds that fit with the ground. Thanks to all of the help from griffpatch_tutor! It really helped me out on this project! Hope you enjoy! For some reason, walls are glitchy in fullscreen. Just play in normal mode and you will be fine.
Griffpatch_tutor for the tutorials on making a good platformer! Also for sprites of cat. (I'm too lazy to make them for an engine, maybe for a game)