strange that a two-colour game feels so vibrant. i really love the transition between the two fields as well. not sure i like how you're just thrown into the game with little explanation, even though the player should be able to pick up on what you're supposed to do pretty quickly, so it doesn't hurt too much. it's pretty much straight up arcade, with very little breathing room spared for each new "talent" learned, but that just keeps the pace going and speeding right along.
i do have to say the difficulty does, on occasion, get ramped up from stimulating, provocative, and challenging (what might qualify as "fun") to what amounts to demanding, frustrating, and (translated, "no fun"). there's also the strange matter of the anti-Z sign near the end of the lava stages: it's senseless and confusing. i am surprised by the lack of a level select / save feature for those of us that don't want to try to mop up all the levels in one go. that'd be a pretty long sitting, don'cha think?
lastly, i think the music is awesome. it's perfect for the game. honestly, it sounds like something out of a Mega Man X game. (i know it isn't actually, you know what i mean.) but the tension is just right given the platforming involved. that doesn't mean, however, that it's a great idea to use it for the entirety of the game, particularly one that could take so long. either give the game some extra tunes or i just gotta mute all PC sound, because there is no mute button for the music or in general. i'm just thankful that the game lost focus when i clicked out of window. i don't remember that being a regular feature of Unity games, but if it is, i'm almost glad it's a Unity game this time... (nope, Unity still sucks). ofc, that goes back to the whole progress function again anyway: if it had it, it might not even matter. just something to think about.