You can use whichever language is most easiest for you. There are no language rules. However, most people here speak English, so more people will understand your game if you go with English instead of French.

use unity ?

I have windows and mt pc has 983mb of RAM 😭😭😭😭 i have loste my best pc 😭 i search programming softeware for this jam ;)

Godot is similar in scope to Unity, but much more lightweight. Though with only ~1GB RAM it might still be tricky to work it.

Try Pico-8. It's a little bit trickier but really lightweight and fun!