I really like the graphics and the approach to the theme. Transitions are nice, it makes the game feel polished.
As others have mentioned, the progression is slow. Even with upgraded odds, houses would never add more than 2 settlers in a 4-minute run. This would have been awesome if the ramp-up was more accelerated so you could get to that power fantasy of squashing little people.
I'd love to see this expanded as a mobile game, it has the potential to be a very fun time-killer when on the go.