I wanted to keep the hunger and anger bars hidden for making the game feel spookier, so I decided to add warning messages when the levels get dangerous. The problem with the parasite getting angry is that you have to calm it by attacking the guards from behind, but that instruction is revealed after meeting a couple of guards because I didn't want to overwhelm the player with information.
If you have any suggestions on how to make the hunger and anger more visible without using bars I'll be happy to hear them, I've been thinking about making this a full game since I liked the idea but couldn't flesh it out much because of the jam deadline.