In the game I submitted this month, I forgot to click 1 more turn, and exited to the main menu instead. It's my first GOTM and I just assumed you wanted the replay file.
When I realised, I loaded up again from an autosave 2 turns earlier, and just ended the 2 turns to get my victory. I didn't do anything differently the second time round, except I just selected random things to build in the cities that completed stuff those turns, because I wanted to get it over with quickly.
The score came out exactly the same.. so it should be cool.... right?