Gun play is surprisingly good, soundtrack rocks, level design is pretty cool. For its time the graphics are good, the physics are insane, voice acting is pretty good as well. The way the physics work with the gravity gun is cool as hell, especially at the end. I really like the way they do cutscenes in Half-Life, the fact that you can still walk around while the cutscene occurs is pretty cool compared to contemporary cinematics and offers something different.

Some level design is unintuitive though, like the one part of the one level where you have to go down all these pipes and turn a wheel to fill the area up with water ... How am I supposed to know to do that?

Some of the puzzles are just obtuse like it's difficult to understand why the developers would expect you to know how some of the mechanics work without wandering around for 20 minutes trying to figure it out, specifically the blow up barrels in the shipping container so you can go under the dock and hit the ramp, like 1. Why would I know to check inside the one shipping container? 2. Why would I expect that blowing up the barrels would actually blow off the door of the shipping container when I haven't received any indication of this mechanic before, like sure I could've wandered around that area for 30 minutes trying literally everything and eventually figure it out, but I preferred to just look at a guide at which point I was like oh lol okay that's how it works

I shot a watermelon and it exploded, nice