A new custom weapon has been added, you can now loot weapon parts and combine them to change the way your custom weapon works. There are four different parts: ammunition, the barrel, a gem and a mechanism. Each part changes something else.
Additionally the inventory system has been changed. Instead of having limited space in your inventory all armor parts are available forever once you looted them. If you loot the same armor part in a later stage, it gets stronger.
And a very small change: You no longer heal yourself standing next to purified obstacles, instead you heal while you are in range of the spawn point.