this game didnt appeared in steam yet?

Why did you stop making posts on Planetary Annihilation forums? I thought they loved your insight on the various subjects you have brought in.

hellatze, for information on Steam see Steam project status?, Steam release push and their two ToDo lists (there's probably more somewhere): Steam Roadmap and zk_plan.

For more information use the search bar.

quote: what happen past 5 years of development?

See Zero-K commits and Infrastructure commits.