I also really loved 999, I actually played it twice. Way back when all of a sudden I got killed and didn't know what just happened. If felt kind of strange having to replay parts after so I dropped it but the game and the story always stuck to me wanting to revisit and finish it. Many years after I did and went a different route still not getting the final ending but reaching a lot further. Watching the full ending on youtube was really worth it. I absolutely love original stories like that game.

Now I really want to start the 2nd game Virtues Last Reward as I heard it's arguably even better. The 34+ hour time required so far has made me put off from it though.

I also notice for myself a big gap in time required to finish games as I'm slow and kind of want to see everything at the start instead of rushing through. I guess that adds to the problem not being able to finish. Another one is Resident Evil 7 which I played in VR, It's just too scary. I feel I have played it for 6-7 hours at least already while the walktrough video at the point where I am at is around 1 hour and 20 minutes of the 5 hours and 20 minutes total.