The theme is optional and just for inspiration if you can't think of your own concept!
We changed our minds. We are grading on theme.
In my opinion, put a challenges and themes category too, it'll be useful, as i myself who has no problem (as in i think I'm good enough for them ) wouldn't use them, a combined category for the optional stuff should be there, imo
Edit: if you did count it, i will probably use the two challenges that dont include GMS2, and one theme