This is just a review for 999, not VLR:
I played this once in high school and absolutely loved it but I don't think the story has aged well for me. I think the reveal of the mastermind and their ability to set up the nonary game requires a suspension of disbelief that maybe I'm not willing to do anymore.
I do like the morphic field stuff, it's a cool way of explaining how you the player can direct the MC with meta knowledge of branching story paths that you often find in visual novels like this.
But I also kind of despise these number puzzles, I think they could have been more Professor Layton-y and less Sudoku-y.