Sorry for late response, but flag?? uhh, a fully red flag with yellow star, that's a vietnamese flag, like this

Hello techAyan
Well, you can start making your game after the jam announced the theme
Also, i think the better practice that involved making game (as you said) is to join other game jam and enjoy your participation , There’s many jam that has started or about to start and GD game jam only had 1 month left before the jam announced.
So take your time to practice yourself and don’t forget to participate this jams 🫙. (I mean GDevelop game jam).
Greeting fiveb
Because you ask other participants to rate your game without play your game, your behavior not only damaging the other’s reputation and fairness but also violating this game jam’s regulations.
I strongly and formally advise you to ask others to play your game, but not rate your game.
- Gia Hưng (Hung Thai)
Based on your specific question, these are my formal responses of each question.
- Gore or swearing are offensive material, if added to your game, your game may be disqualified without any warning
- Only be a part of 1 team, no more than 1
- Only 1 game can be submitted by person who submitted the game, submit more than 1 game would increase your chance of winning, which is not fair.
Additional:
- You must submit your game before the voting session start, submit your game AFTER the voting session started result of game disqualification