Hi GM, sorry for just telling you now. Actually, I finished it two weeks ago. It happened when I couldn't find the password for the safe. I didn't know how to find the combination of numbers. I joined the discord to find out but when I tried I couldn't, I finally understood how to find the numbers based on the paper fragments from the book I found and the carvings on the table. After that, I got through the story smoothly and had a happy ending.
Another difficulty I encountered was from conversations between residents near the mine site. Slowly managed to find answers. For the record, I am using version 0.5.1 and playing it on Android.