Thanks for the detailed feedback! 🙂 These are some really useful points, especially regarding item descriptions and making enemy discoveries more informative.
The blue icon in the bottom-right is a starter protection effect — it protects your character from bleeding, radiation sickness and plasma burns during the early levels. The number shows how much of that protection is left. Your comment makes it clear that this isn't explained well enough in the UI, so that's something I can improve.
I'm still actively developing Bunker Delta, so feedback like this is very useful. Thanks for giving it a proper try!