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If we talk about the location itself, there are no complaints – I also really liked it, especially the first room (except for the puzzle). It turned out great. I wasn't even planning to continue playing with that character after succeeding, as if he had already had enough adventures for a lifetime, but in a way, it turned out even better, because, as I wrote in the quest description, almost all of his dreams came true.
Regarding sacrificing the NPCs, I apologize, especially to Locken, it was my mistake. They were still used to trigger the traps in the first hall. I should have replayed that part differently.
As for the balance, I can't say anything – I haven't checked it, but I'll probably trust Ples's opinion; he usually knows a lot about these things. Considering our mini-duel with Ment, I think there's some truth to it.