With new spyware added to it this great game is no longer playable. Is there any alternatives, similar games? "Children of dead Earth" is great one, but it too militarised.

Please provide more information about this new spyware you're talking about. Whatever it is though, you can add a rule to your firewall to block all outgoing traffic from KSP. Other than that, give this one a try: http://orbit.medphys.ucl.ac.uk/

KSP now shipped with Redshell "protection". Which is nothing but spyware. Just rear licence agreement you need to sign.

"Logs a gamer's fingerprint when launching the game for the first time." "Red Shell logs a gamer’s fingerprint on clicking custom link. Run campaigns on Facebook, Google, Twitch, YouTube, or anywhere else."

Redshell inclusion to KSP isn't something new and has been actually removed in v1.4.4.

There is Simple Rockets 2 in Early Access, in case you would like to try it.

That thing was removed from KSP, and by default most programs are not allowed from the firewall to contact the external world, unless firewall is disabled or the program was granted permission, etc.

Most games/programs collect some sort of analytics (hardware/software info, time spent in games, etc).

That doesn't make it okay.
One of the primary reasons we GOG users are here is that we don't tolerate unethical developer behavior such as the inclusion of DRM and data collection, regardless of whether it is majority or minority behavior.
Additionally, this company's past betrayal of trust via the inclusion of Red Shell provides ample reason to distrust any current or future statements regarding the type and degree of data collection their software is engaging in.