I completed the game! It took me roughly 30 minutes to get past The Passage, but after that most of it was smooth sailing. Droplets 1&2 feels like I got passed it by luck, but maybe it's because of my s k i l l s as well ^^. The difficulty arc is also very well thought of, although I think The Passage should be one of the few finale levels instead, the first few levels laying down the base mechanic I thought was incredibly helpful. The music changing when the player is in black or white is really cool as well! Knowing you, you always make captivating games, and this just adds one more to the list.
Overall very extremely polished, great concept, a bop of a soundtrack, and outstanding gameplay that is executed very well. I had a lot of fun in this, well done!