The concept is really neat. However, unless I got a stage wrong, it got to the point that I feared and that it was too much to me.

In level 18 it seems like I have to make a tower of citizens by falling into the laser, then destroy part of the tower to let one through to reach the button... But if you fail to hit the button, you have to remake the tower to get another attempt at the button...

This isn't a puzzle game anymore, but it's simply a chore.