Really unpredictable the piece movement, but I liked! :)

Simple idea but well-executed! It's interesting that the "unstable" comes from construction.

The UI was a bit confused at the beginning, but then I understood that a queue of blocks to drop.

The countdown display is raw but acceptable. I don't know if it's feasible to be shorter for those levels which are easy to pass.

Besides, it maybe useful if a button could be provided to exit current level.

The black/white fits the hard mode challenge and it could be a mobile game with polished graphics.

Nobody:

Me: *drops box on the flat surface*

Box: *reeees off to the front and back of the flat platform*

Okay, the browser physics was really unpredictable, sometimes annoying. But I was stubborn to quit and successfully finished all.

https://imgur.com/QJ3XmYc

I think 15 as one of the really hard ones.

Definitely unstable, I think I had to rely on luck a lot, and when it worked, it was satisfying.

Good game

got through all 18! this was fun. definitely felt like there were many ways to solve and i wasn't left just trying to unlock the one secret way to do it.

blocks were pretty grippy which made for some cool solutions. nicely done!