i have never programed or created a game in my life... just how hard would it to for me to do custom level in pseudoregalia?

i absolutly love the game but i feel the game itself have so much more potential. I know this is going to be an unpopular opinion but making the combat a bit more complex and adding more bossfights and rework proggresion a bit and it would be the greatest game ever created.

those goals are a bit high so i just want to create some simple custom levels in the game, but just how hard would it to be for me?

i have used scratch and had some little succes with it, i was creating a lot of code logic in geometry dash and i was creating towers in eternal towers of hell in roblox. I love game design and i feel pseudoregalia is THE game I would like to design but i am not sure if it would be hard for me.

any thoughts?