You did well... Very well.
As the series comes to an end and you move on to other things, I've come to several conclusions. One, you know how to make a satisfying ending which also requires a well-executed choice of presentation (movie instead of a game). Two, you know how to deliver messages through a balance of being literal and figurative (colour as the theme provides a literal solution in a figurative environment visually speaking). And three, to my surprise, you brought out a lot of emotional tears to the Newgrounds' communities' eyes (and I hope Mai's as well).
It didn't happen for me, but I did use the series to share the experience with somebody else as an indirect message to her. (Your releases have been well-timed and worked with my intentions to communicate with her. No stolen credit of course, not that I can anyways.) Your proficient organisation skills to produce the series are clearly shown, and do not concern yourself of the quality with the deadlines you chose to meet. Parts of the artwork are designed to be simple (characters that nearly lack all detail), and others are designed to be very complex (the world you created has so many functioning parts, it's immersive enough to be believable and living), while the music only compliments and supports the artistic approach you have intentionally gone for.
I may be mistakened to make a single review for an entire series, but I do feel compelled to write one. I also wish to express my confusion that this has not been tagged for the front page yet which would have increased exposure. You have earned this right. 10 out of 10 for a job well-done that literally affects people. Our reviews prove this strange effect. If this is not on the front page by the next treasure hunt, be assured your work will be nominated almost immediately. Best of luck in your future endeavours.