And starts reasonably quickly.
And runs really well on Linux, with no quirks or hicups.
(As someone who uses a Linux machine as the "primary" desktop, only switching to a Windows machine for games and other things that need it, I find it really nice to have a quick-to-launch game that runs perfectly on Linux.)
AND allows you to easily spin up a dedicated server for multiplayer, WITH easily synced mods between all players.
AND well-defined mod migration for updating mods to new Factorio versions without breaking them or your maps.
Also the beautiful hires Czechnological artwork.
It's top-notch design, execution, and graphics.