you must be slow on the uptake, the controls are super easy and the platforming is fine, if you want to play a game with bad level design play (i wanna be the boshi)
also this game is pretty dang cool for a free game no one asked you to play it, if you cant play platformers just say so.
There are at least six and all of them are listed under the (very brief) "IMPORTANT INFOS BEFORE" tab on this website. It is literally right below the game itself, this is just a "you" problem