Changelog:

Global:
Gauss gun replaced with an experimental prototype with 3 firing modes + max charge can damage Gargantua through his armor.
The snowmobile and its physics have been changed and redesigned.
New dynamic implementation of location lighting.
The fauna of the Xen world now reacts to the actions of the player and other creatures.
Returned multi-core rendering.
Bullet ballistics calibrated and now in real time.
Game levels have been updated, workarounds and ways have been added to simplify the levels.
All available types of grenades are available from the beginning of the game.

Temporary and test changes:
Iron sight is disabled until the next updates.
Flare pistol can now set Combine Assassin on fire.

Changes to locations:
1) Arctic - the location is divided into several maps.
Game zones have been optimized.
Added polar bears and basic stealth elements.
2) Borealis - more small details for the most complete immersion in the atmosphere.
3) Black Mesa - Expansion of the location, useless scenes replaced with attention to the plot.
4) Xen - Visual changes, revitalization of the fauna, simplification of the quest with islands.
5) Aperture Science - Visual changes, more voice phrases and details to the plot.

Cosmetic changes:
Combine Soldiers rework, no more reflections on the armor.
The fire extinguisher now has an instruction sticker, when fired at it, the fire extinguisher will make a boom.
Some of the weapons are retextured, reanimated.
Key characters have been visually updated.
Low poly background models are replaced with new ones.

If the picture on the screen is too dark, you need to enable full screen mode and adjust the screen gamma. Plus added an option for the wide 0 (zero) button on the right side of the keyboard to automatically boost the brightness.