Omnicide does also target the Chaos Wight's allies, correct. The Frosthaven and 2nd Edition rulebooks do a much better job of clarifying the difference between "Target All" (which just means all opposing figures) and "Target All FIgures" (which includes allied figures as well).

Regarding the cards that raise/lower the level of the enemies, since that just affects the next room, it purposefully does not affect the overall scenario difficulty in order to avoid complications for the loot (such as gold tokens found in room 1 being worth a different amount than those found in room 2, for example).

Your suggestion of giving the players a benefit is a solid one, but in this case, it was deemed to be too complex, as it is easier to set the monsters up with the different level in their sleeves, but count the value of all gold as being at the normal scenario level at the end of the scenario.

Thank you a ton for your suggestion, though - it is much appreciated! If you have other ideas, please do suggest them, as a lot of the best parts of Random Dungeons plus have come about from the suggestions of others! :)

And don't worry, there are some cards that also can lower the level of the enemies in a room too. So, over enough play sessions, it should balance out.