Well that was an enjoyable little map! Short and sweet! If I could give some feedback though:

- If there's some way to do it, perhaps make arrested rebels move against the walls or otherwise out of the way? There was a point where I could SLAM open a wall, and ended up barely able to get out of the room, having to kill 2 of my Combine buddies with the blast because an arrested Rebel was laid down on the floor blocking the doorway. Perhaps this is something to put to the main EZ2 devs instead though
- The mechanism to open the third-floor door isn't really clear. To be honest, I only knew how to unlock it because I saw it in the comments here before playing. It might be nicer if the monitor you unlock the door at was already focused on the door when you find it, and there was a lit up button or something that actually opens the door in that room, so you can see it now open on the monitor once activated, rather than having to interact with the monitor to show up the camera on the door in the first place.
- I noticed in the underground section, there's a room with blue goop you can jump in. If you jump in and run to the cubby in the back-left and crouch, you can actually crouch under the hurtbox of the goop and see out of the map without dying. Might be worth raising the slope under the goop (or just make falling in the goop an instant kill or something, since I don't think there's a way out if you fall in?) to prevent that.
- The gate in the alley the rebels pour out of at the end of the level disappears, but remains impassable to you despite that, there's just an invisible wall there. It might feel better for the player if there were a one way slope there of some sort, rather than an empty gate frame you just can't go through. Or just leave the gate there and make all the rebels at the end jumper-rebels instead or something.