For having only learned Godot like one week ago, and this being your first completed game, this is really impressive, Good Job! Even if we don't take that into account, for a 48 hour game jam, this was a pretty good game!
If I had to give you a little bit of constructive criticism it would be that for a player that fast, I would have made the camera a little bit bigger so you can see where you are going a little better.
-- Also, keep in mind that any game you make is a lot more difficult to play than you think it is, that comes with you as the developer knowing exactly what to do, and how exactly to do it. A good rule of thumb is to make a game easier than you think it needs to be.
Overall, I'm glad I got to play this game, thanks for participating, I think its a good entry!