The art, design, typographic choices, and page design are immaculate! I can really tell this is a team full of talent.
The idea is really interesting and unique! Definitely adds a new layer of strategy to the normal tower defense formula.
One thing I would've liked in the UI was some sort of 2D depiction of how much the landscape is tilting, as it's not always obvious with the free camera. I don't think it would need to be super detailed, just a scale or maybe even just a # of degrees out of whack you are.
The soundtrack is really fun and fitting as well. Really fantastic work, great job all!