Very cool! My best score was 40 points. Hope the Pico-8 discussion earlier this month was useful.
Yeah, the discussion helped quite a bit--it was basically my intro to the topic.
Looks like you ran into a bug since your screen isn't filled. If you moved a piece left or right at the wrong time, it would trigger game over (since I test for loss by checking if a block is being applied to a space that already has a block). That should be fixed now.