Very cool game! Even though I read backtracking was necessary, I was still surprised to find extra colors when I went back through the levels. That was a super cool idea! I loved the animations and the music too. Very chill song. Great concept and could definitely see expanding this w/ more worlds and levels.
The UI elements were also not scaled properly for me if I didn't use fullscreen (no big deal b/c I did use fullscreen, but just wanted you to be aware in case you do anything else w/ this)
The only flag I was missing was the blue flag in level 3. I couldn't quit figure that one out. What's the solution to that one?