Hey, this has an elegant simplicity that I dig, personally. The layout is clean with a restrained use of color, and the scope of the keep is tight and usable. I like the fire-and-ice mashup from the inspo, though it may be difficult to incorporate much of the background information. The Wand of Shape Ice has no obvious purpose (from what I can tell), but it seems that it could lend itself to all sorts of shenanigans.
As for what Cri pointed out, you may have intended the Area 2 bridge to be above Area 10 (typo of Area 11), since that room describes the flame monsters being unaware of the bridge above them slowly melting.