Factorio but at 1% speed.
All mining and crafting machines operate at 1% of vanilla speed. And everything else is slow at s*** to match. This IS your grandfather's Factorio.
A few tweaks to make playing at this speed work:
- Power drain (minimum power consumption) removed from all entities.
 - Power generation and power draw decreased by 100x
 - Player mining and crafting speed decreased by 10x.
 - Red science the only one that can be crafted by hand.
 - A few additional items in starting inventory.
 - Belt speed set to 20%
 
Recommend playing on a server that continues running after player(s) log off, and disabling biters.