This is a lumines demake on the cozy PICO-8 console.
Form 2x2 squares to score points. You can build combos while a square fades, for extra points. Let the sound guide you, pacing is more effective than pure speed.
PICO-8 is a lovely way to learn game development, as the constraints guide the design decisions.
I had some ideas for a versus version of this game, like puzzle fighter, but wanted to start out with a simple single player prototype to test the feel and rules.