A nice killbox, classic but embellished by textures and models from Portal. Personally I'd have used a pneumatic sound for the lifts, in tune with their telescopic columns, and I'd have added a metal or rubber ring where they go through the grates, for a better look. Maybe a slightly different color of the floor, now very similar to the walls, would make the final effect less monotonous, and placing the light props in the upper balcony a little higher, would allow a better flow, because now the player stops against them. But are just details, not so important, talking about a killbox map. BTW... why don't you use a custom decal or a game_text to inform you made the map? It's a good thing to know who made the map on which you are playing ;) Anyway... a good work, keep it up! Cheers.