itch.io

V7 is in alpha, it's being actively worked on

but if you're desperate enough to try it now

you can download the V7 alpha versions here

https://github.com/Anuken/Mindustry/releases

yes and no, if the recently captured sector is near an enemy sector then "reinforcements" will fight the sector

You can stop this by claiming enemy sectors. They're called attack missions so you need unit factories, You unlock the research for them by producing silicon

The mining outpost level

it's an attack mission so you need the ground unit factory