This felt like stacking real building blocks — I got absorbed and kept playing level after level.
Careful, straight stacking works, but risky stacks felt the best. Holding a shaky tower until the flag rises was tense — I liked that.
The screenshot is my most precarious moment.
I would come back if more shapes were added.
One small idea: an Esc pause menu (Levels / Main Menu) during play would be nice, to see where I am.