The game is built around NG+ and it can get more interesting on additional playthroughs. Each time you reach the end, it can change several aspects of the playthrough. You get out of it what you put into it. If you only do one playthrough and reach the end, it's easy to go "that's it?" and feel like it wasn't complete. But the game really does have some pretty neat things that can happen the more times you start the next round of NG+.