Well I downloaded and ran your project file, the visuals look cool!
I couldn't see any .GD files, did you write any scripts?
If not, I recommend starting with a small area and working on your player movement, so there's at least something to do in your submission
Next time, I recommend separating your tutorial and main area into different scenes, and then getting to the end of the tutorial will trigger "Change_scene_to_file" to load your main level!
Great start!