I got the Ice Queen ending, it seems there are several more. I'm not much of a 'replaying' person, so I haven't played it through again... I'm not sure I like the way it just takes your items and dumps you back at the start... somehow, it had less of a sense of closure than if it had just closed. Maybe it closes if you get the 'best' ending, I'm not sure.
Anyways, onto the level itself. It was enjoyable, with a solid difficulty. That you-see-the-umbrella-then-you-fall trick was
evil.
I wish the hold-A-to-walk thing had been forced in an official Nifflas level, as it's now all too easy to forget about it. I'm glad you had the courage to add it in.
A lot of default tilesets were used, but you used them well so I'm not complaining. I liked the relatively rare but effective use of COs. I'm not complaining about the music either.
Good job overall