Thanks for playing the game and the kind words!
I wanted to create some platforms like that, but never got around to it. It would have been nice if I could have controlled their speed better too.
I am not sure what is causing the camera drift. This is the first time I've used the SpringArm node, so its possible I messed something up. Since it can handle collisions, I think it gets a bit funky with all of the trees. Also there is one area in the 3rd level where it acts strange despite nothing being there to move it. I'll have to learn more about that node. When I play, I'm not seeing it drift when I take my hand off the mouse. Do you happen to have a controller connected?