I think something more memorable could have been done with the snow finale, but it virtually doesn't matter since it's the fact that it's just another dream state that really elevates it. Moreover, dreams are rarely specific, but rather vague, elusive so there's that. I held my breath when Mal appeared. Intercut with Gordon-Levitt doing extraordinary things in corridors and elevator shafts enhances the snow action also. Works for me. One of the best movies of the last ten years.
But again, I don't recall why it had to be a snow-based conclusion. Perhaps there was a reason for it. Seems that, given the premise, it would have been awfully easy to take that finale in any number of directions although the Page character, as I remember, was there to sort of steer the whole dreamworld into something the team could deal with, without any kind of abstract and absurd interferences to ruin the mission.