Did you encounter any bugs? (game crashed, etc)
Only crashed a few times but I was playing on 1.0 and your updates hinted it was linked to a memory issue and so I saved very often and only had to deal with the crash a few times and didn't lose much.
Did you do the "Impossible Request" Quest? And if yes, did you managed to finish it?
I don't think I did that quest. I remember going into the girls house and not seeing her, but I wasn't sure if it was a time of day issue or not. and I was already at the end of the game so I decided to just clear out the game.
Did you do the quest in the Mine Caverns that unlocks a certain tf?
That's one of the guild mission ones right? The map has it listed as Eerie mine. The one of the poisoning and the crystal? If so I did it, and I thought it was fine. Overall it was late enough into the game that I'd made notes of all the caverns that needed an upgrade to see in, and was starting to wonder how to do it, and I had more than enough food to push against the poison. Actually found the segment to be panic inducing and chaotic as I rushed blindly in the near dark looking for salvation. Which I'm sure was the point. Overall I thought it was a great experience. If that isn't the mine then I didn't find it.
How long was your play time?
Looking at the in game clock, 33 hours and 45 minutes. I included a screenshot of my file stats if you're interested.