This is a great concept! Seeing the staggered swap buttons on the second stage really wrinkled my brain. Once you figure out how to focus on a single lane/color and reroute from other lanes, it becomes more of an execution challenge than a problem-solving challenge, but another pass at this to add a more aggressive time limit, (if there is one at all) or some other element to reward players who can juggle multiple lanes would go a long way. I really had fun with this! And congrats on having a clear and functional UI in your very first Godot project.