How you find time for Gentoo and impressive playing experience?

Like I said, Gentoo isn't really a time-sink once you have it set up the way you want it.

Endless Space 2 is on my GoG wishlist awaiting a decent discount, and Galactic Civilization 4 appears to be steam-only, DLC-everything, and kinda expensive... so I haven't paid it much attention.
Time is finite and games that are both steam-free and GNU/Linux native take priority. Stellaris is both, so that's the 4X I've been playing most recently. vOv

Is a classic for sure, and I did play it way-back-when (didn't everyone?). But it's also a 4X/grand strategy, so a comparison to Stellaris might be apt but one to Starsector is not.
Starsector is not a 4X (though there is a mod to add 4X elements), nor is it really a strategy game. The real-time arcade(ish) fleet combat is the core, and while you can play that a bit like an RTS it's at its best when you're piloting a ship directly.
My comparison to Star Control might not have been ideal, I was thinking specifically of the top-down combat in SC 1 & 2, or SC2 gameplay overall - which is more action-adventure than strategy.

How you find time for Gentoo and impressive playing experience?

and what you can say about Galactic Civilization 4 and Endless Space 2?

why not MoO2?

Rimworld

Is whatever you want it to be, from peaceful village-builder to organ-harvesting cannibal death-cult. IMO mods are needed to get the best from the game though. The modding scene is nuts, easily the biggest and best of any game I have played.
if you like Dwarf Fortress, you'll like Rimworld. If you don't like Dwarf Fortress... You'll probably still like Rimworld.

Aren't really comparable. Stellaris is just a 4X, but it's a very good and very deep 4X, and I like SciFi settings. The DLC-gouging gets a bit much though.
Starsector is something else, and there's not really anything else like it. Take old-school Star Control top-down combat, add deep ship customisation and fleet mechanics, throw it in a trading/exploration RPG-lite overworld, and you have... Genius. Or Mount & Blade in space, as you prefer.
If you haven't played it, play it. It's cheap, and it's exceptional value.

The Diablo 3 that should have been, what else is there to say. Classic loot-goblin ARPG gameplay, a truly insane amount of content, and zero bullshit.

I don't really do MMOs any more, but Eve is the original (destroyer of all free time). DO NOT start playing Eve if you have a life.
Seriously though, if you like player-driven MMOs, it's the OG and the namesake for the "massive" part of the acronym... Runs on a literal supercomputer, and is pretty much the only place that thousands of players and the equivalent of 6-figures real-world cash can go down in flames in a single battle.

Indie, janky, completely unique. Kind of a 1st-person 4X sandbox I guess.
Decent combat from dogfights to massive fleet engagements (if you excuse the AutoPillock), with a fully simulated economy and the ability to buy (or steal) pretty much every ship in the game, or build an empire to rival entire species.
Story is so-so, but that's not the point.
Mods are many and awesome, the latest iteration of X3 is actually an "official" mod and it's the best the game has ever been.
IMO X3 is still better than X4 in terms of gameplay and polish, but the latter is slowly getting there. Egosoft has a history of supporting their games with updates and patches for decades after release, so I'm still mostly optimistic it'll exceed its predecessor.

Fun physics sandbox so far, but also appears to be designed to be as annoying as possible. Like I said, undecided.
Good enough to be worth the purchase price IMO, but unfortunately also into the DLC-gouging thing.

Currently, modded war crime simulator Rimworld, X3, Starsector, and most recently (still undecided) Space Engineers.
In all-time hours-played (and maybe in order): KSP, X3, Rimworld, Stellaris, Grim Dawn, Quake (1), Doom (1), Morrowind, Eve Online, X4.

good taste

huh, its long story
my gaming hobby started at 1993(ZX Spectrum) and 1997(PC based at 5x86(amd cpu) + S3 trio64v2(with no 3d acceleration))
Here four game studios that made an impression on me:
-Westwood (C&C series)
-Bullfrog (Dungeon Keeper)
-Blizzard (Diablo 1, WarCraft 2)
-NewWorldComputing (Heroes of Might and Magic 2,3,4)
at most of all i played RTS + AFPS(Quake, Unreal),
but now tired from fast and violent games and decide switch to something peaceful and calm like popular games from yours list,
and want to ask you what exactly you find for yourself at
-Rimworld
-Starsector, Stellaris
-Grim Dawn
-Eve Online, X4, X3
-Space Engineers
from among from others games of - sci-fi colony sim, 4X, modern ARPG, space ship simulation, sandbox engineering?

You?

Sure, when I have time. Mostly stuff a few years old though.

And what yours favorite games genres/series/titles?