This game is an interesting variation of Tetris. I only realized very late on that the key is also valid the other way round 🙈.
In my run-through, green was often included in the key, but very rarely in the dropping. But it was also fun 😊
Thanks for your comment! The game mechanics are part of a larger idea I have for a puzzle game I'd like to develop for mobile, prototyping in pico8 first.
Good point on the key order. I'll add that to the instructions in the page.