Hi. I had the same problem. I got stuck outside trying to empty the tank. I cant get into the shed (i think) and the control panel shows the state of things, but i can't change anything. I tried going round in circles waiting for the tank to empty, but i am unable to swim to the bottom after several attempts.
Other problems;
During the conversations, the UI has what appears to be a reply dropdown. Clicking this drops me out of the game to the itch front page. Luckily i can resume, but the dropdown is always inactive. So i just choose "continue" with that response. At least i assume it's a choice dropdown? maybe not. Anyway, this was a bit weird.
Otherwise, game looks good!