:0 i get where u came from now ! Really cool concept, you'r off to a nice start ! If i may, here is a really cool interactive tutorial that helped me a ton when making my first platformer (the one you commented on !) : https://gmtk.itch.io/platformer-toolkit
It's really nice because you get to really understand what makes the feeling of a good jump. The youtube channel (GameMaker's toolkit) that made it is also full of usefull things.
Have a nice day !