I liked it. Not quite sure what I was supposed to be doing at first. Once I found the second vapor I figured I was supposed to be collecting them. Music fit the atmosphere well. IMO maybe the default controls should have been arrows and space, a little less cramped, but you allowed for customization, so +1 for that. Some of the platforms were a little wonky on the corners, player seems to get stuck for a few frames/seconds and then gets affected by increased gravity and kind of thrown straight downwards. Happened 2-3 times in my 1 play through, can't imagine the cause. All in all, the stuff you said you were working on (particles and composing) seem to be coming along nicely, they sounded and looked good. Good job.