Its even nicer that said city builder is free.
Before The Ashis a hexagonal web client-basedstrategysim created for the Godot Wild Jam 79 by Aviv Levy.
Said game jams theme is growing.

Vesuvius is kind of your co-mayor in Before The Ash.
It periodically spews flaming boulders that set terrain tiles alight, with blazes spreading until they encounter water.
The flaming boulders may also double as a means of clearing away structures youd like to replace.
After a few minutes of this, you’ll wonder how you ever managed without a neighbouring volcano.
Still, theres only so long you’re free to cosy up to ole Mister Vesuv.
Itll eventually blow its top and annihilate the map.
Your job is to rack up the highest score possible before it does.
Id love the developer to flesh out this idea some more.
For a similar-but-different take on the idea of living with anti-social mountains, check outLaysara: Summit Kingdom.