This was a fun time! The implementation of expansion with the puzzles worked well and the art + progression were all nice to see! Always a fan of expansion in mysterious temples.
I definitely needed several hints on the ice room. It might've helped better to have it split into a few smaller sections to let players plan ahead a little more for each section before hints are needed.
If Elise explores any other expansion-inducing temples, I imagine it'd be nice if the expansion played a role into some puzzles too.