I don't know much about gmod (P.S. I also don't play roblox if anybody is asking). You can phase through every object in the map, though I kind of like it. It's almost like a feature similar to goat simulator's bugs. Some require more precision, time, and angle but it's quite easy to learn. Hold forward and any horizontal key at the same time, it is so your camera is around 45 degrees when running to a wall (I tend to jump while doing it). You can run to a wall backwards while also strafing. There is also this "super jump" you can do, it's hard for me to explain though so you figure it out yourself (it involves phasing), I have my own way which I don't know how accurate it is. So yeah, phase through objects and super jump for outmaneuvering nextbots than using it to cower and hide.
Anyway, cool little game. Some nextbots have an unfair strange ability but it's cool. I personally like the cop one because it has amazing music. My favorite map is map 3, next is map 1, and lastly map 2.