Yes, you can edit the game page all you want. That's not part of the game.
And anything that is not game breaking stays in. If something is completely game breaking, contact me first about the issue and I'll see about giving permission to update.
Viewing post in Small question about changes!
I did not see this post before making a change. Hopefully it is okay, but I fixed a game breaking bug where once you left an area, you could not return to get the item you needed to finish the game. Since the game page wasn't locked, like in other jams, I thought it would be okay to fix that kind of thing.