This ost has some bangers in it. You can also find it on bandcamp if you want the soundtrack but don't have the game on gog.
I have not bought this package but played Trine 1,2 and 4 All on Linux, Trine 4 running through wine compatibility layer. While I haven't played Trine 3, the others were Games I enjoyed with nice graphics, a soundtrack that I listen to from time to time, and some fun game mechanics. They have some replayability through some secrets that are hidden across the levels.
This game tells it's story in a really good way, I played it almost in one go (about 5-7 hrs). It is best compared to a book or a movie but it gets the storytelling right. I would say that you should wait for the discount. Except for the alternate storylines I see little replayability. The graphics were ok (I ran it at ultra settings) However, I had a few annoyances: Your character walks slow, this makes walking long routes irritating there are many rooms that add nothing to the story or its setting and seem to be there just to make the building a copy of the real one. On some occasions it might be unclear what to do to progress the story. I played this in linux, it ran well, but my mouse did stutter, this might not be the case for you. I really enjoyed the story but this game certainly isn't for everyone.
