i'm on a superior dregree and for the moment I just know some Java (With JavaFX and swing) and some JS.

I saw to use Phaser with JS but idk if try to learn an engine while I make the game is the best xD.

If you're interested in game development, you have plenty of time in this jam to build something while learning.

Don't think "big", find a kind of game already known, the type that you can find tutorials or other examples online and that's it...

Phaser is good for lots of 2d games. Building a platformer or a top-down game is almost a no-brainer.

How about libGDX or PixiJS? Actually, there are many engines. You can also check out FXGL. Just use keywords on GitHub, it's an ocean of engines.

In any case, it will be painful. If you don't want pain, choose Godot / Game Maker / Construct / something big and convenient.

Phaser is great and has tons of tutorials and examples. Depending on your idea you can actually create a nice game quite fast.