FTR, NL is a simulator, not a game. It has no objective to it, therefore, it is not classified as a game.
There is a very steep learning curve, and there is tons to learn about it, and coasters. You can implement every element of a coaster into your NL track you would like, everything from heartlining, to lead-ins/outs, to 3Ds theming, ect. ect.