Combo Pool is simple and great fun: use the arrows to aim your ball, and hit c to fire it.
It's a game where you throw colored marbles against each other. If two marbles of the same color make contact, they merge and upgrade to the next color. Your lifebar diminish with the number of balls on the field. If you lifebar is empty, you enter in a sudden death mode, and your last ball must save you by removing some balls.
Controls : use arrows left-right to adjust direction, and key "c" to launch a ball. Click on the game to give it focus if buttons doesnt work.
It's made with Pico 8, a "fantasy console" that enforces strict technical limitations on what your games can do. The result is a growing library of perfectly-designed, disciplined 8-bit style game projects. They're often tantalizing suggestions of how good the video games of an 80s childhood should have been, but weren't.
You can cheat by only ever firing straight up, but even then you can get in trouble because of the number of balls that form on the axis. Other suggestions for refining the game: allow players to hold the button to determine how powerful a shot to release, and have a button to hold that allows more refined angles.
Here's my best score: