Xenov: Ascension

Planet Xenov-81 is under attack.
Can you save its people?

Xenov: Ascension is an isometric voxel tower defense game, with roguelike elements, in which you are a general in charge of protecting a city from foreign invaders. Prepare your defenses, and keep the city alive for as long as possible.

There are multiple strategies you can use to approach the game; you could go for a farming build, or for a tower-intensive one, for example. Can you save a million people?

This is a Ludum Dare 46 submission; the Ludum Dare page can be found here.