This is rad. I really like that you've set up this wider world in a good amount of detail, but the core of the module zooms in really closely into the encounter at the top of the tower - a single event that will have significant consequences. That mix of scale is really cool and gives the tower encounter a lot of weight.
Also the visual presentation - the mix of art styles and the paper minis in particular are really charming and I love that you've presented this as a physical object first and foremost.