i love the environment so far! The overall scaling and modeling is great far and it really feels like a snowing scape. I would suggest using a tillable texture for the snow to gave it a little extra variety, just something with a small amount of grit.
When moving into the final I think giving the character some direction on where to go is prevalent. Also giving the player information about why theyre playing and what theyre playing. Maybe this is solved with a narrator? I can't wait to see the puzzles!