1. Load the original goat game first. It starts the engine & Goatz then loads
2. Quit all other apps and possibly wifi
3. When selecting a new weapon, do this is slo-motion mode
4. Hard reset iDevice before starting a new game (hold Home button & Sleep button until you see the apple start-up logo)
It still crashes on me. These help a bit
toadc about Goat Simulator GoatZ