Very nice concept and lovely graphics.
Unfortunately, I couldn't even finish the ice planet due to a number of bugs, such as the character suddenly flying off to a distant wall on its own, crawling on some invisible platform in the middle of nowhere, or getting stuck at a respawn point.
Due to the lack of visual cues regarding gravity, it was also hard to tell whether some other unexpected behaviours were intended, like sometimes being able to get sucked in to a ceiling far beyond the reach of the character's jumps.
It's a pity, because the game definitely has its charms. If the core gameplay got quite a bit of refactoring, I'm sure this could turn into a really nice entry.