Visually a very nice game, loved the polish that went into the levels since previous Demo Day, and the animations and movement now seem much smoother. Level Design feels solid and they mostly flow well. There's a few rock textures not quite placed properly, and as such, aren't tiling properly, but I'm sure you knew that. The main thing that felt off was the level that forces the player to glide under rocks - It came a little soon. Not saying its too hard or anything, but just came a little early, as I was still familiarizing myself with the Controls. I think you might need a "softer" reset mechanic then death. Think blowing wind, rushing water. Something that lets the player practice without feeling like they've messed up, before you make them do it over the death-pitfalls.
Controls felt great, although terrain collision needs some work here and there. Characters can get stuck mid-wall, etc.. The boss was a little on the Easy side, but fun.
Overall, huge improvements since last time. Keep it up!