First person shooter

Researchers from Italy have developed an artificial neural network that’s capable of generating a theoretically infinite number of new levels of the classic 1993 first-person-shooter 'Doom'. If you've spent the past 25 years wishing 'Doom' would never end, today is your lucky day!

Strafe is a first-person shooter video game developed by Pixel Titans and published by Devolver Digital.

Half-Life (1998)

Feedback loop - shield bar. This screen shot from Halo shows the player's HUD. There is a feedback loop that is created by the shield bar, which tells you that you are ready to go into combat protected. As you get shot the shield bar goes down which tells you you need to get to cover to let it recharge, which will let you jump back into combat. Repeat ad naseum.