My impression of DOOM II after finishing the first game for the first time is that it's more of the same fun you come to expect. The added depth from new weapons, enemies, map and environment changes really help flesh out the solo campaign. While nothing of the actual look and feel of the game is different from DOOM, the sequel somehow manages to garner its own identity despite being the same engine. I do think it would have been better to cut down on the number of maps you have to traverse with arguably monotonous environments, but I can understand wanting to strike while the iron is hot at the time of its release. There was nothing else quite like DOOM at the time, so why not have even more of my precious life shaved saving the world from biblically-correct demons.