I have the same question, I just got this game and discovered that in patch 2 they removed lots of weapons and changed gameplay by removing some of puzzles and cutscenes. Like at the very beginning they remove the whole section where you have to blow up a fallen statue to clear your path to the temple. And with this change they also removed a funny cutscene following the explosion. No explanation was given as I see it for these changes. They have mentioned that they are working on a bigger update after patch 2, which never materialized. My personal opinion is that they were working on gameplay and weapon changes and patch 2 was planned as an intermediate patch until they finish the final patch. But after patch 2 they stopped working on the game altogether (maybe because bad reviews / sales) and it was left hanging with unfinished patch. So, here we have now half-patched game with cut out content. My advice is to roll back to patch 1 for the best experience and ignore patch 2 altogether.

PS: I would appreciate it if someone could provide insider info about the mystery around removed content in patch 2 and the reasons for this weird and unexplained downgrade of the game experience.