Great idea for the game. I was worried for a moment since it asked for me to install something like Created by Game Maker without knowing that was to play the game.
I think you could give more options/choices for the player to get lost in as the final maze, for example, there's like 1-2 different choice paths that are like midway through the maze. Some earlier choices and a bit more open areas like all the other levels will help with its cohesiveness. I really like the one map where a new wall appears when you hit a trigger of one of the colours. More of that would be cool as well.
Keep it up. Really good and potential! Are you going to build on this? Add more colours later? Or coloour mixing does something?