Sure KSP is good there is a thread in here someplace about KSP it just has not been posted in lately.
Lots to do and play around with and tons of mods.Only thing is it is still in development so after each Beta update some mods do not work and get updated or get updated to make use of improvements.That being the only downside keeping up with changes and mods.
You can make rovers and probes as well as shuttle type designs or a traditional rocket.It can get pretty advanced.
You can get it from
https://kerbalspaceprogram.com/ or Steam and both have a demo.