Endless Horde - The combination of hordes of regular enemies and increased waves of specialists makes this condition much more difficult compared to the other special condition, and could be more difficult than higher difficulty levels. Recommend splitting this up into two conditions: increased regular enemies, increased specialists.
Power Supply Interruption - I expected this mode to make everything dark (almost pitch black since zones are underground) except where the flashlight is pointing. However it appears to add a “fog” to the entire zone that even the flashlight cannot see through. This is not how a blackout would actually work underground. Visibility should be clear wherever a light is shown and pitch black everywhere else. This is particularly distracting for veterans as the “fog” makes it impossible to see enemies at range.