This mod adds a lot of new content into the game. Those include new items, some different sounds, renames/descriptions, a couple of unlockable maps and edited item stats. The crafting list has been greatly increased with the ability to craft ammo, turn items into other tools or recycle them for materials and weapons mods. It does make the game easier but you can also end up with no resources for more important devices.
An important gameplay feature I should mention is that secret rooms can no longer be easily accessed by just firing at the weak walls. Weak walls are more resistant and the most easy way to break them is by using explosives, HV weapons and similar end game weaponry.
It also adds more content for those who pre-ordered the game or bought the DLC. The starting gear has been modified, added more starting options and edited item stats.
Complete list of items, crafting recipes and installation instructions in the Readme inside the File.
Here's the download links: