Aww, I was looking at the IMDb page and it looks like they did major rewrites of Alex Hirsch's script. That's a disappointment because Hirsch's Gravity Falls was excellent and he seemed like a perfect fit for this movie. Now it's being helmed by Rob Lettermen, writer/director of such luminous works as Goosebumps, Gulliver's Travels, and Shark Tale.
Damnit.