Delightful puzzle platformer! Painting is a lot of fun, and it's helped by the gorgeous art direction.
Lots of cool technical art on display too. I saw you generated all the graphics in code. Are you using SDF's for shapes?
I also used desaturation as a lever to control warmth, but sometimes crank up the blue channel to emphasize cold.
If you're interested, there's a very interesting video about color temperature from YouTuber "Lighting Mentor", it's living rent free in my mind since I first saw it this summer.