personally, my big score was this game: Otogirisou. it is what was called a "sound novel" at the time, but would be now called a visual novel.
i picked it up for two reasons. first, i'm in love with the box cover artwork. there is something perfectly moody about it - a roughly inked haunted house in the distance, surrounded by briars, which looks like the only shelter during a pummelling rainstorm.
(and this is indeed the plot of the game)
second, it has an incredible soundtrack that was given a full orchestra treatment in the 90s. the album is called "Game Music Concert 2" by Tokyo City Philharmonic.