What an experience of a story! I love how you've written both characters, and although the ending was bittersweet, it holds a certain power. An emotional mess, but so worth it.
The art style is also great, I love the use of colors~
I love the concept of the game! It's well executed, with each character having their own experiences with the new color, and it affecting Jana herself.
I also appreciate the monochromatic color scheme with the "eververt" popping out. The soundtrack is also great~