Thanks for the feedback, and thank you for taking 5 minutes to figure out the oiling part! I definitely missed adding clear clues for players, clearer instructions are a must. I should have add some kind of highlighting hint or some pointer to make it easer to understand.
Also, I'm so happy you liked the artwork! This was my first time hand-drawing art for a game to test if I could finish it in a short time, it makes me really happy.