Played it with my brother, much more fun together than alone. Good level design. More checkpoints on the long-distance horizontal jumping room to the right would be nice. Got stuck there before replaying it. Killed myself trying to figure out the jumping jacks spire, until I figured out you just let go, and let gravity do its propulsion thing ("What have I been doing all this time?"). It was a little laggy, maybe the particles effect. Dash sound repeating when you stay still on ice was a little annoying. Coyote timing would be nice.
Brother: The fire element worked nicely with vertical motion, while the ice element worked nicely with horizontal motion. Cool parallelism (or should we say perpendicularism?)!