Thanks for the feedback! I will consider relocating the Grenade Launcher, as well as upgrading some of the Knights to Death Knights. I can also adjust the brushwork in the hallway with the Fiend too, thanks for pointing this out.
The water trap wasn't really intended to be hard to figure out, it's mostly just there to put a bit of pressure on the player for a moment before being free to move around again.
It's hard to gauge difficulty as it can be very subjective. One of my friends, who is quite familiar with Quake, but does not play it regularly at all, struggled a lot with the map. My boyfriend, who is also familiar with Quake and frequently plays twitch shooters, also struggled with it a little bit, but he does not play Quake often either. I take it you must play a lot of custom Quake maps and know what to expect, so a map of this particular style must be trivial.