I like when stuff you seek is here somewhere in a dungeon, but maybe as the end of the game and not some dungeon among several dungeons it's indeed unsatisfying, I 100% agree that going on without a goal is boring. I think it's also linked to intimidation being indeed a bit overpowered, because there's at least one way to go there, bypassing the fight, which implies solving a puzzle.
Intimidation is a bit strong indeed, I just think lowering its power now that the game is released would be very boring for players who're currently playing the game and are now using it as a tool. Potentitally in 6 months in a big update. Note that one of the reasons you manage to is that you've got big fat equipment (pieces of equipment have a hidden threat score, and the threat score of a chainsaw is big), in theory at least, in practice I need to check again. However you missed the big boss' equipment in the process
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Floor 0 is easier than floor 1, don't hesitate to do this one first if you go on.