There is 2 levels of mining. Coal miner.lv1 then electric miner.lv2
There is 3 levels of assemblers
There is 3 levels of belts splitters and underground
And more levels of other objects

Imagine a tech tree
4 types of this tech tree
Transportation
Military
Mining and ore processing/burners ...

It be better to see how many people know c++, Please reply if you know some c++

That's up for the Dev to get off their ass and develop a android os and of course iOS, yes it be so fucking cool to have a factory on mobile with freaking multiplayer, think of the possibilitys.

But remember they only have 10 devs so making it available on phone or tablet would be easy, trust me!