Here is my playthrough of Disjointed Realms on Hard mode (it took me more than an hour to finish it, so i splitted the video in 3 parts):
Part 1:
https://www.youtube.com/watch?v=1mTPkdNM4Us
Part 2:
https://www.youtube.com/watch?v=TI_f-59psVs
Part 3:
https://www.youtube.com/watch?v=z06i7S0A4eU
Yep, the map has some gameplay problems... with such a small amount of health and ammo packs it's almost impossible to have fun :/ i was constantly quickloadind just because sometimes i missed a shot or lost some health, and i knew that I was not going to get any ammo or health anytime soon :(
oh, and sometimes the enemies were too far away, and sniping enemies isn't fun (unless you have a sniper rifle or a railgun, which Quake doesn't have) :P
Apart from that, the map is really beautiful, the architecture is pretty impressive, the interconected corridors, the teleporting monsters, the use of color-changing fog, everything is awesome. I can't believe this is your first Quake map. Congratulations! =D