Hello all, and first : Good job to all the team for this game !
I have some suggestions :
It could be cool to have some fluids pipes (like water, oil, pressured steam with water boiler, ... why not hot lava from a volcano !) to use, and to connect to some buildings or crafting machines, to make some receipes ?
Another idea for the Uranium milestone : transporting uranium on conveyors could be dangerous for the character (i saw you will implement a antirad suit), but it can be dangerous for the conveyors and nature too. It could be great to have to craft some reinforced iron (or lead) box and bring them on the miner input, to be able to extract ans transport it safely.
A Night/Day cycle and Solar panels + battery ? Hostile creatures on night ?
Foundations with holes to pass conveyors through them ?
Conveyor spliter / merger with filter (to send different objetcs to a specific output) ?
Ore mines with diminishing returns and a hydrolic fracturing system to regenerate mines ?
More complexe caves with some ore mine in ?
Security Cameras you can put on wall and a terminal to remote control from distance to a camera, to see how a distant factory works ?
I will post more ideas if i have some.
PS : Sorry for my bad english it is not my native language :)