I'm still learning GameMaker Studio 2 but have been dragging my heels following the Shaun Spalding "Complete Platformer Tutorial" so I thought this would be a good opportunity to push for it. I just don't know if it's appropriate to submit something that's not really my work other than just copying down and implementing the code/assets. Even if I replace all the art with my own it still seems a little wrong. Not sure, so figured it was best I asked.

I think it's OK as long as you are open about it, the jam is here to help motivate you to move something forward, so using a tutorial and adding you own art is fine.