I love that you have a README and License file (main criteria for open source category). I especially love that you stuck to the game theme and colours in the README.
Colours and theming is very slick. So very cool! I love everything about this game. The way it starts, tutorial and everything is smooth and gives you all the controls to go further. Addictive. Interesting take on the theme and very creative with the changing colours (not all gamers would like this, but I enjoyed it). Graphics, sound effects, and music all very on point. KUDOS and congrats on another fun game.