Make a village in your browser in free building game Habitat

It's a deceptively cute village building game where your entire village fits on one screen, with each of the little houses, the trees and crops, represented as tiles on a tiny grid. To chop down trees, you merely click on them. To plant crops, you merely click on them. To hunt those boars roaming around the place, you merely...well, you get the idea, I'm sure.

It's all very intuitive, until it's suddenly not. What do the (incredibly faint) numbers on the ground mean? And when will the Quest mode accept that I've made 10 wheat? Habitat is mostly good at introducing its mechanics, but when it isn't, it stopped me from progressing, stopped my village from thriving, and it's the reason (because it's not my fault, of course) that most of my village died of cold, as the climate chilled.