Up and running now! It's a great start to a game.
I make games in Godot now, but I got my start in Unity. I noticed the camera shakes when the player pushes against the side of a platform. I think the problem might be that the player is being moved without using Unity’s physics system, causing the movement code and collision system to fight over the player’s position. You could try moving the player through the Rigidbody in FixedUpdate.