I made it all the way through with no hints and boy, this is awesome!
This is one of those super engaging and fun puzzle games that really get your brain going! The story is wacky and entertaining, and the concept of colors and mixing them to avoid brown is really creative. The mechanics are very simple and concise; They make sense to the story, characters, and the game in general, making it more satisfying when you end up solving a challenging puzzle.
I actually wasn't entirely sure how the game worked until the first challenging level, which forced me to learn the mechanics and very quickly got me accustomed to them. This is an excellent example of why great level design is important; You've designed the levels to not only challenge the player, but to teach them as well. The first level, for instance, is a great way to kick off the gameplay, as it is basic enough for a beginner to grasp and figure out. The level after that introduces mixing colors, the ones after that show the consequences of making the brown color, etc. The progression is really smooth and well-designed!
Feel free to try out my game as well, I'd love to hear your thoughts: https://wasabiiii.itch.io/grass-elemental-demo-demo
Everything else, like the art and music and sounds, fit really well together to create this fun retro vibe throughout. This game is seriously great and has so much potential, keep up the excellent work!