I tried it on Firefox mobile and when I lose in the second difficulty level I can't really see anything but the "game over restart" message.

I'd like to be able to see the score and the layout to analyze the game.

Really nice job, though! Fun concept.

Thanks! Will adjust the layout to make post-game analysis easier

Fun and addictive game - I’m also at 27-23 now :)

Uncertainty regarding piece state is also my number one feedback. Maybe rather than numeric, make that states visibly discrete in some other way?

37-13! Thinking about it a bit, I realize the main uncertainty is which parts are "in danger" - which will switch color or "hardness" next turn with no influence?

Or a tug-of-war like indicator showing the threshold. (Although not a sufferer, blue-green is a common colour blindness)