hola te recomiendo estos videos son muy buenos y seguro te ayudaran 

First wait for the theme to be released. Then brainstorm 10 - 15 ideas you could make with the theme in mind. Make sure to not make your plans too big, as times flies. Focus small and if you have time left over, then expand. Most importantly, this is a game jam, so have fun! Even if your game isn't the best, it will still be a learning experience. Good luck!

Hello you can use post processing in ur game

i started my first game jam in 12 yo too .... dont make the first idea come into your mind . think about it write about it and then start making it :)

Here's a quick tip, if your stressing out about the theme or things aren't going your way, take a break, it helps

Hey, I played your game fully. I think it is actually a really cool idea. Since it is still very early, adding sound fx would be good. one specific area is on the dialogue. 

To do that, just play sound from an audio source in the code where you add each character (letter) to the ui.

I am also 12 :D

if you want to add screenshots go in Edit Game -> add screenshots -then save - then go to the Page  top Edit Theme -> Screenshots switch from Automatic to Side

Hi, im only 11. I'm confident you can make a decent game.

First, brainstorm about a few ideas.  Try thinking about what topic/genre your game is. Then think about a few scenes.  After that, split those scenes into different ideas.  Then pick one that you just feel interested in. 

Or if just don't feel like it, just take inspiration from other games.

After that, just try to make a game using that idea.

This helps me a lot.