It is considered adventure as it is different from a 4X game It has a story and a goal It has scripted events which occur at certain times or when certain conditions are met The AI isn t really an AI it is just scripted events Every play through is almost exactly the same the only major thing that changes is the way you play it In contrast to this a normal 4X style game is often highly random each time you play You can play it exactly the same way and have completely different results Also the other sides are played by AI which usually are playing by the same rules you are It is far from a Master of Orion clone and I would only recommend it to someone who likes Master of Orion if they also enjoy adventure games or perhaps detective style games I suppose the main thing I m trying to say is that this game is linear and scripted whereas 4X games are open and random