Thanks for stopping by and sharing your game on my stream!
This is a simple and well-presented idea, but it took a little while to "get" what the game was about. I think PICO8 is pretty limited, right? I don't know it well. It could have used some sort of tutorial or intro to the mechanics, but I got it eventually.
As mentioned on screen, there was a perceived difficulty curve: At first I thought it was incredibly difficult because there weren't a lot of bubbles to make lines with. Then I thought it was too easy because when the showerhead moved to the left or right, you could literally do nothing and let it pour grey dust where you wanted it to go. The red dust is a nice way to counteract that non-gameplay, but perhaps it might be better to have the showerhead always in the middle when it's grey dust, and always moving when it's red dust?
Overall, nice job on completing this! Well done and thanks for stopping by!