I liked how the mechanics unfolded naturally. There's no big tutorial dump; you just start experimenting and it clicks. The blue sphere mechanic, especially, was introduced in a really clean way. I figured it out just by messing around, which always feels better than being told what to do.
Once the color doors and switch mechanics come in, the level design starts getting smart without feeling unfair. You definitely put a lot of thought into it.
The chill music fits perfectly for a puzzle game, and visually, the cloud effects on the spheres looked great. It's simple, but polished in the places that matter. Nicely done.