Gave it a shot, I think I got to unlocking door 202, but when I tried to enter it the game crashed. This was a very large game for a jam, and very ambitious. I'm impressed!
Some feedback:
The spaces you move around in are quite large, and Vasiliy is to be honest not very fast, and has bad cardio. That is fine as long as you don't miss something or have to redo something, and that is the reason I just gave up when the game crashed. The game gets a bit samey after a while. Open door, get into other room, get key, repeat. Fighting enemies was also a bit samey, hear the sound, click on them, move on. I think (opinion incoming) that if more focus would have been put on less systems, you would have had time to make those systems more interesting. The art is good, programming seems to be working well and audio is good, I just think you are all spreading yourself too thin and would be able to make something really good if the scope was smaller and you'd have more time to polish the game.
But to be completely honest, it's a game jam. And the fact that you submitted while having so much ambition is really impressive. Great work!