Took me 19mins and I found 5/7 secrets.
I liked how classic the secrets were, howeverI didn't like the "A"s near them, they kinda kill the point of secrets being secrets if you're told they're there. There are more subtle ways to hit a secret like for example a wall being shaded differently, or a funny sprite.
Overall cool design, my favourite part being the one after the tunnel, but there is nothing that hasn't been done countless times before.
However a couple of things look a bit off, like some misaligned textures or textures being too "big" and not fitting the size of the rooms, or that cramped squarish doorless elevator looking like it got teleported back from 1996. I didn't mind the sewers everybody seems to criticize though.
About the tunnel, I was told not to get there early on, that's what I did and it went fine

I did find the secret devastator before getting there though which I guess helped a lot.
I enjoyed the boss fight however I think you should have made him spawn earlier for it to be more interesting : I had time to kill all the mini BLords and other enemies around him before he showed up. I liked how the viewscreens shows the area suddenly crowded with aliens when you open the path to the boss area.
A couple of nitpicks : I would have liked more small effects to make the map more lively, like explosions or for example, or when unlocking the Dukeburger, it could have opened the window at the same time instead of just unlocking it. Also, there are a few doors/elevators that are locked, where the player can't get behind, but it's hinted as if the player was meant to go there (the "managers" office in the Dukeburger" and the bar with the flickering arrows in the reception hotel). Obviously I understand that almost every map needs doors that you can't get behind, but it's kinda weird to see them hinted that way.
Pretty good classic map overall, but again, there is nothing a Duke player hasn't seen before.