This is just my two cents, but if you're designing a level using pre-made props, obstacles, and enemies that are all designed to work with specific pre-built gameplay, you haven't really participated in a game jam. I'm sure you have to submit here on Itch, so Mario Maker would be out anyway (I'm not positive, to be fair), but I'd personally see much more value in your project if you teamed up with someone who was developing gameplay and did the level design for their project. Someone was in just such a position in Discord. Again, that's just my opinion, and I'm not running this thing.