I really enjoyed this one. Cramped combat has always been a pleasure to me, and this was flawlessly executed. Not just looking good, but the many doors, panels, and walls that open and close revealing new areas and unveiling monsters. I especially liked the opening and closing ventilation ducts that push you off the platform, making you time your jumps carefully.
There's a surprising amount of gameplay packed in this tiny map, and it sure won't feel tiny.
Congratulations on your first standalone map, its a real winner.
First run demo, hard skill: http://www.quaketastic.com/files/demos/orl_ion01.rar