I feel like having no weapons in a horror game like just an easy and obvious design choice in a horror game. It doesn't work most of the time like how Shattered Memories have proven. Alien Isolation thankfully didn't adopt this approach but for most of the time, you didn't have an effective weapon against the Alien. The problem is once you get the flamethrower late in the game, you feel invincible as you can stop the Alien from attacking you.
There are obvious pacing issues with this game, it drags far too long and ruined some of its goodwill and credibility earned with a bad ending. Some of its climactic moments occurred in the middle of the game making the end parts of the game a bit boring by comparisons. While RE4 was also a bit too long for its own good, the end parts were never boring thanks to Mikami's sense of pacing. In Alien Isolation, I thought the game was ending in several different instances before the actual end of the game.
Aside from the bad ending, there are no bonus content upon finishing the game. Well there are survivor mode and maps but those are not related to the story mode. Thankfully the pre-order bonus included 2 DLC episodes based on iconic moments from the original Alien movie. I recommend playing the movie DLC after finishing the game but I can imagine there are fans only played these episode without bothering with the main game.