TLDR its...not that great get it on sale.
Story: picks up right after the game though a specific ending, it would have been cool if things were slightly different depending on your choices but we know one of those choices leads to a more permanent end to things so i get it tbh. You spend the majority of this expansion escaping a new complex under the control of the horniest AI to ever exist. The characters are still good throughout but you barely get to interact with them with much of it being front loaded. Its not bad but its not great either.
Levels: The map design feels much more claustrophobic than the base game. yes the base game had some cramped areas you had to navigate but most of this DLC feels that way. it starts off with open areas in the swamps (why does every slav game put me in swamps? its like the russian version of sewer levels.) but then you head into a facility and seem to spend the bulk of your time there, to make matters worse the facility is mostly bland as hell and over stays its welcome with a massive fetch quest to find these bead machines.
Navigation of this complex becomes a nightmare after a while with no map to speak of and the waypoint system completely messed up towards the end making you waste time going in circles.
Enemies: There are only a few new enemy types. The new manniquen enemies seem neat at first but you'll quickly grow tired of their attack patterns and how they soak up more damage than the black suit guys. Again, they over stay their welcome. There was a large roster of enemies in the base game why not make more use of them?
The bead enemies are fairly interesting in that they can combine to form newer forms with more powerful attacks, a system i wish was more dynamic in nature tbh. To seperate them you need to use the Alt fire for your new gun a crazy machine gun laser.
New items: Theres basically 2, the machine gun with a laser and this new item you can consume to summon your horny AI gf to help wipe out enemies in a area. Again its neat but feels...i dunno tacked on? I'm not sure if you're supposed to find other weapons but all ive had access to is the shotgun, pistol and 2 melee weapons 1 new and 1 awful. Why cut down our arsenal like this? They also remove 3 of your powers locking them for no real reason, hope you weren't a fan of freeze or mass TK cause they ain't available lol. You DO get a new time slow power so theres that but again it feels...lacking.
If theres more to it and more to find thats great i guess but i'm stuck in the complex, can't find the last bead and the nav markers are beyond useless sending me to rooms i've already cleared and the combat has gotten beyond stale already with the lack of enemy variety combined with lack of weapon variety and even power variety. Not gonna say this DLC sucks cause it really doesnt but it also feels like they took away half your toys and then asked why you aren't having fun.