You said in your text that you wanted really to be good in gamedev.
So take the gamejam to your heart and try something for yourself... It doesn't help you if you just upload a course-project from the 2D-course. Just to get a free course...
Try something out, even if it is buggy or broken, ugly or just almost unplayable. But try something! Or just change the sprites.
I believe you can do that! :D