I didn't really understand the game at first, probably because the ingame text is not in English, but I think I maybe figured it out. 
Phase 1 - Explore the room to identify if it belongs to a human or a monster
Phase 2 - Decide to take the transformation pill or not (Stay human or transform into a monster)
Phase 3 - Door open and go through. If you guessed right, you get to the next room. 

This could use quite a lot of polish, but I kind of like the idea, if the differences are more subtle, like maybe having the things to identify if its monster vs human be something like a plate of food that can either be spaghetti or intestines. Not sure if that's what you were going for. 

Also just a note that if you don't play in fullscreen, the text is not fully visible in the game and is cut-off, including the timers. 

why in game text is russian but end game text is english? :D BTW I don't understand what I'm doing. Good job for completing the game bro

Hi!  I don't speak russian so I'm not sure what the text was saying but the blobby friend was very funny and I liked the premise.  I don't think I was able to vote, but it was making some sense to me otherwise.  Cool concept.