Comments

if ( gInitHUD )
{
    m_fInitHUD = TRUE;
    m_bSendMessages = TRUE;
}

fgd
@BaseClass = ZHLT
[
    zhlt_lightflags(choices) : "ZHLT Lightflags" : 0 =
    [
        0 : "Default"
        1 : "Embedded Fix"
        2 : "Opaque (blocks light)"
        3 : "Opaque + Embedded fix"
        6 : "Opaque + Concave Fix"
    ]
    light_origin(string) : "Light Origin Target"
    zhlt_hull1(target_destination) : "info_hullshape (standing)"
    zhlt_hull2(target_destination) : "info_hullshape (big monsters)"
    zhlt_hull3(target_destination) : "info_hullshape (crouching)"
    zhlt_usemodel(target_destination) : "ZHLT Template Model Target"
    zhlt_copylight(target_destination) : "ZHLT Copy Lighting From Target"
    zhlt_noclip(choices) : "ZHLT No-clipping" : "" =
    [
        "" : "Default clipping"
        1 : "No clip"
    ]
    zhlt_invisible(choices) : "ZHLT Invisibility" : "" =
    [
        "" : "Default (visible)"
        1 : "Invisible"
    ]
    zhlt_customshadow(string) : "ZHLT custom shadow (Alpha/RGB)" : : "Float value that specifies opacity of this brush entity. 0.0 (opaque) -> 1.0 (no shadow). Enter three values for RGB."
    zhlt_embedlightmap(choices) : "ZHLT embed lightmap" : "" =
    [
        "" : "No"
        1 : "Yes"
    ]
    zhlt_embedlightmapresolution(choices) : "ZHLT embed lightmap resolution" : "" =
    [
        "" : "[UNSET]"
        1  : "1 "
        2  : "2 "
        4  : "4 "
        8  : "8 "
        16 : "16"
        32 : "32"
        64 : "64"
    ]
    skin(choices) : "Contents" : "" =
    [
        ""  : "[UNSET]"
        -1  : "Empty"
        -2  : "Solid"
        -3  : "Water"
        -4  : "Slime"
        -5  : "Lava"
//        -6  : "Sky"
        -15 : "Translucent"
        -16 : "Ladder"
        -17 : "Fly field"
        -18 : "Gravity fly field"
        -19 : "Fog"
    ]
]

• The brushwork and detailing is very, very nice indeed - maximalist, but not too crazy, and pretty consistent throughout.
• Good use of inaccessible areas, they really help achieve that classic Half-Life illusion where places seem like a part of a bigger world.
• Sequences are very well executed (that scientist with the gun startled me as much as I startled him, lol), and the use of sentences is spot on.
• Most of the map is pretty silent, could use some more ambient noises (especially in larger areas)
• There aren't many enemies or weapons - if it were an intro map in a campaign that would be fine, but since it's a single level it feels a bit lacking.

• These types of light brushes are too solid-looking, a lower FX Amount (renderamt) value would make them more transparent.

• The pushable cart in the beginning can be used to climb past the crates blocking the corridor, but there is no way to get back from there.

Seems like an excellent place for a secret

• There's a null face in the room with the barney and scientist that is visible from the vent (if you look hard enough).

Between the table and the chair

Closer look

• The player can jump down this rusty shaft and get stuck.

Just make the lid solid

• I'd recommend placing the crowbar around here instead of later, to encourage the player to break this window.

I usually avoid breaking things with bullets

• This whole area down here is a bit too dark, the ladder is barely visible.

My gamma is 2.2, maybe that's why

• A foolish player can wedge himself between the large elevator and the light on the wall, a clip brush is needed here.

The cables got de-synced

• Your grates and railings should be using the Solid Render Mode, not Texture. Texture makes them glow in the dark and show glass decals when shot.
• Try to avoid using the Fit button when texturing. It stretches and squashes textures and can lead to compiling issues further down the line.

• I went into the elevator and pressed the button;
• the door closed;
• the elevator along with the door went along the given path;
• near the glass doors, the elevator stopped;
• the doors opened and the elevator went on;
• The elevator stopped at the end of the journey. Glass doors closed.

1. the top trim under the hallway with the 69 above
2. the crate on the shelf near 1. is missing it's bottom
3. the top green metal crate is missing it's bottom