And man, is it hard. I'm at the last 3 floors, and a lot of it seems luck based, thanks to the random drops not giving you what you want or need.
My only advice is to try and pray to guardians that dwell in your armor. You'll have to reload your saves quite a few times to get desired results, but if you know which guardians boost what stats and play to your strengths, you'll make it. Maybe XD --- CRYPTIC METAPHOR!
Ugh, I beat it. At the last 2 floors, I pretty much beelined it to the final 3 bosses. Their magic was rather weak in comparison to my stats. I can't believe those Nagas and blue alligators hit that much harder XD.
Oh yeah, and there's still no ending. But we didn't play it for a satisfying ending.