I played through all of the routes, and it really didn't take too long. This being said, the voice acting is quite good, and I really enjoyed the story / conversations. This game isn't for everyone, but it was a fun diversion. This doesn't fall into the sexy version of adult games, but it definitely covers adult-oriented material, or at least teen-oriented material. Not a kids' game. Pick it up on sale like I did, and it's worth the price. At full price, it's a bit steep for the quick story / short gameplay. No replay after getting all 15 routes, but fun replaying while trying to achieve them.
53 hours into this game, and I still want to play it every night... Problem is that it's one of those games that spin through your mind after you've played, and if you are at it before you go to bed, it replays again, and again, and again... This is a "One more turn..." kind of game. By the way, the plus version after having finished the first round is well worth playing, surprising as it is. Even better is that you can swap your team between the two games, and make certain that you complete every last part of every zone. Kudos to the developers. Also, thanks very much to them for the extended trial version (as played here on GOG), which is the reason that I purchased it!
