Nice game! Like it! Only slightly awkward controls. I also found some coin (XD) but it is not taken or my Wine is buggy ...
I will make a Linux build soon, it will probably work better! For the camera, its goal follows the character and in certain zones, the goal is the average of the player transform and another fixed point in space, which gives a special framing. And it just always lerp to its goal, that's how the transitions are achieved.