It's literally just the first one but it supports multi-threading (it runs better on modern computers), introduces new mechanics that compliment the existing game play, and has way better graphics.

And yes, it supports mods. It's even got an in-game mod page through mod.io.

The only issue with the game atm is that Stardock decided to use AI to generate UI elements. This has resulted in a very poorly made interface where imagery used to represent things like research options or ship types is so generic you really can't tell what's what.

It's literally just the first one but it supports multi-threading (it runs better on modern computers), introduces new mechanics that compliment the existing game play, and has way better graphics. And yes, it supports mods. It's even got an in-game mod page through mod.io. The only issue with the game atm is that Stardock decided to use AI to generate UI elements. This has resulted in a very poorly made interface where imagery used to represent things like research options or ship types is so generic you really can't tell what's what.