Sporesteel

A logistics-survival strategy on a hostile planet. Your train network is the economy — and the front line.

Your trains are your economy. They're also your guns.
We're building a colony sim where the supply line IS the front line — no separate "defense mode," it's all one system.
The alien creep doesn't wait for you to catch up. Mines get overrun, ore gets cut off, and your ammo trains have to reroute on the fly.
Lose your first colony and the game doesn't end — you keep building, just a little more desperate.