i didn’t use half life as direct inspiration for this but i’ve played through those games so many time i suspect i will always have traits of them in my games lol. the thing on top is just a health bar and below that on the right is the missle bar, i never got to the polish stage like i wanted to but had planned to add numbers and clean up the icons for the health and ammo. c’est la vie. also i’m a huge fan of secret doors, but i did something very dumb and placed a secret door in front of progression lol. the original concept didn’t have them quite so secret so it made sense in planning. i’m really glad you liked it!