Hi! To answer your questions;
- Please make a new page! I remove a lot of spam games from the jam simply because they were created way before the jam even started. (You wouldn't believe how many people abuse jam submissions) Making a new page let's me know the game was developed within the jam's time period.
- That works for me! The only thing I would avoid doing is like, copy and pasting a whole game, which it sounds like you aren't doing!