Levels have backups saved automatically in %appdata%\Zeepkist\Autosaves (paste this into the File Explorer address bar). I believe you can also access this in-game through the load levels menu but can't remember exactly how Yannic implemented it.

A version, or multiple versions of the level should be present in one of the folders contained there

[note: not a developer, I only host the community events]

how do i fand the one i'm looking for and i ended up making a new level in that save spot becase i gave up hope. i hope i did not miss up.

i fand the level in the backups. thanks. i made a new named save of the map.