Fair warning, i only played a couple of hours and didn't advance the Tech Tree very far and i'm still on my first planet so take it with a grain of salt.

For me at least it is fun, i like the "gigantic" target of building the dyson sphere as an end game and i enjoy the constraints of building on a 3D Ball with limited space but you can wrap logistics around the equator etc.

In a comparison i would say it's not as fleshed out and not as polished but as i said, not a lot of playtime and its early access. But for me at least it scratches the same itch as Factorio.

So if you think about buying it read some Steam Reviews and watch a couple of Videos, but for me at least it was worth buying :)