Here you have a demo of your map. Copy the file to /id1 and type playdemo mkt1_coce in the console to watch it.
https://quaketastic.com/files/demos/mkt1_coce.zip
Found the first secret later while testing if there was something new on other skill levels.
The map has some interesting ideas variety and 3d alike layout, more than many from mappers with more experience, and i suppose that you wrote that the map is so far only for easy and nightmare because you did not implement skill settings.
On the other side there is not much to kill with the two Quads as they are before some button pressing, and the amount of armour items is excessive even for skill 0. I would also add a high tier enemy later in the map even for skill 0.