Many things to say
I was very surprised to see that the game was in 3d. However I was instantly dissappointed by a very wild camera and running and confused by the amount of buttons. Speaking of buttons it was a good move to make them customizable, but I really hate that # button wasn't changeable. I have a laptop and full numboard doesn't fit, so I don't have the # button and I couln't progress farther than the keypad, unless that's not the way to solve it.
Speaking of progress, I was slightly stuck at the pick locking part. Didn't realize you had to tap the button, it just wasn't too obvious. Also disliked the fact that I couldn't backtrack out of the vents, I wanted to check the other doors in the mansion, but I guess they just had more guard behind them. Speaking of the guards- they were relentless. Crouching and sneaking didn't help. Died a lot. Was surprised (and glad) they didn't respawn. Jumping over the fence was very tough. The ground seems so slippery and the camera just swings everywhere. The guards had the same problems as me. There was a time on the first floor of the mansion when two guard were alerted by me but they couldn't run up the stairs- they just slided in a 300 degree circle around the ladder bumping into its sides while running. Also about the degrees, it was 23 degrees Celcius outside while snowing but inside it was -2 at times (0 celcius = freezing water). And I didn't find any use for the nuclear bar, but that's probably because I didn't finish the game.
About the camera. in small rooms it goes behind walls and shows the white void outside. So it gives away the flaws of the engine easily. Making it a first person perspective would have solved that. Also I guess there's no hide or cover system and the trees and elevations are there for decoration. And I guess the alarm system was just too much. It seems impossible to never die or trigger an alarm.
Im a kind of a linguist and English is my third language, Russian is my second and my first is Kazakh (suprpised to hear a brief mention of a Kazakh politic mentioned in the intro). So as a person who spoke in russian pretty much my whole life I was relatively fine with the written russian. The girl who did the voice in the begining did have a noticable accent (as if she spoke at one point but the forgot the language partially) but didn't make any mistakes I noticed and spoke understandably. But I was horrified by the sheer amount of swearing in the gameplay. Here's a typical encounter with an enemy: "Bitch" blam! "Fuck you!" blam! "Bitch!" "Fuck you!" Blam! Blam! "Bitch!" "Fuck you!" blam! and he dies. I think it took me about 3 million rubles to get my jaw off of the floor. So the amount of russian language used in the options led me to believe you were making this game for russian audiences as well. If not, then you used too much of, what americans will see as, unreadable font clustered in the menus.
So in conclusion this game just begs to be a 2d side shooter. Somehow I found the 3d engine in Sierra7 a lot more impressive, even though it didn't have too many textures or details, but then again that game had predetermined paths for the player. Some wall designs looked like a grade schooler drew them but that's just nit picking. It's a shame I couldn't finish the game. Please do something about the # key. Changing it to "C" would make a nice square of buttons to work with. So anyway very good effort. But there's a lot of improvement or you just need to reconsider the dimensions for the sequel. Then you will have a game above 4.00 and reviews aknowledging your hard work.
Best of luck to you