Thank you for playing!
>>What to the barrels(?) do?
It's trashcans. Trashcans play a significant role in the original game. Pathologic fans (Russian speaking community) jokingly call the game "a hobo simulator".
>>What is the flame symbol for?
Organs.
>>How am I supposed to know when a round ends?
0:00 is the time when a round ends. Like an original game. There are many conventions from the original game.
>>What would make it (knife) available?
After the third day. I thought about a new little features every 3-4 days until the end (12th day).
I could encourage you to play further... But unfortunately, the jam version has a critical bug. After buying a scalpel, the game crashes. But scalpel is the best way to obtain organs. And organs are very important to good ending.