Woah, thanks for the extensive feedback!
First off, I watched the video you linked and really enjoyed it, I'll definitely be coming back to it when working on new game design ideas.
Overall I agree that the UI needs some work, ideally the game would be able to explain itself better without the tutorial, which in the end may even be more confusing to the player.
I agree that a better visual feedback for the player when injuries are healed would be nice, I like that idea of the bandage. I feel like the overall style is not really cohesive, like each part being a computer folder for... I'm not even sure why, it's the first thing that came to mind and just rolled with it. Ideally it would have a more consistent theme, something hospital-ish to sell the fantasy.
The idea about having a cause for the injuries is great! Could be fun to add some silly situations that cause them. One of the ideas I had initially was to give each human you played a random name and look, and in the end if you lost there would be a tombstone with some kind of joke as the "last words".
This makes want to go back to the game and keep building upon it and add all these ideas and mechanics, even if the jam has finished. Again, thanks for the thorough analysis! It's really encouraging to me as a beginner.