Yup there it is: Github Sources
Some stuff my be a bit messy cause I rushed quite a lot in the end, but you will hopefully find what you are looking for. I think I kept things very simple for the rotation, it's mostly playing with the camera distance and FoV. Let me know if you have any questions.
Yes that would work. The windows create holes into the tower using stencil, and have a little 3D room inside. Currently the inside is mostly black, but could be more detailed and contain a character, 2D or 3D. Then, the game finishes when you reach one of the climbing hold object, which I selected to be the wooden circle at the top of the tower currently, but it could very well be a window instead.
