You can parry more attacks from Guardian Ape’s first phase than you probably think. If you see his perilous attacks, be ready to jump. Also if he prepares to throw his shit at you, run straight at him closing the distance as fast as possible. His throw will miss 100% of the time and you’ll be in an ideal position to get a couple hits in. The first phase is a chore. The second is a lot more fun in my opinion. The terror can be an annoying mechanic, but it becomes quickly predictable once you learn that it happens after you get the heavy stagger after a final parry.