So, I toyed with the idea of having 666 levels, but thought that would be a bit too much...
Yes, the controls are a common theme in the feedback here, so I have been giving that a bit of thought. The only thing I can think of is left-click and drag to move, but I have played games that have that mechanic and you end up forever picking up and putting down the mouse, which also interrupts movement.
By the way, the middle-mouse click and drag is how you control the camera in both Blender and the Godot 3D viewport. It just takes a little getting used to.
And thanks for playing and the feedback.