This felt genuinely quite immersive and fun for its length! There are only a couple of models, but all of the characters are presented in very different situations that slowly build up a sense of the game's world. I like the low poly aesthetic and animations. The mostly grey palette really makes the glowing technology pop out on screen to create a stronger sense of unease! Some ambient noises or a mildly oppressive musical track would really seal the deal for setting the tone.
At first I felt that player movement was too slow, but the level design is quite packed and eventful, so it doesn't end up being too big of an issue. I think that the camera should focus on the dialogue when it appears to make it more immediate, or you can just display it as subtitles on the bottom of the screen. The uncluttered interface and simple controls feel fitting.
The player character is fairly strong, so it's not quite horror, but there's also a grim setting and various events and story to discover, so it's not quite a full action game either. I think you're hitting all of the right vibes if your goal is to make something like Bioshock or Half-Life! Nicely done, I hope you'll keep working on this project, it has a lot of potential and a promising start!