Unity 3D Game design

I want to design and build a strategy game that focuses on education, strategy and simulation. Maybe something like clash of the clans that gives you upgrades on weapons, gear and etc.

Maybe something sorta like this?
https://play.google.com/store/apps/details?id=com.PerfectTap.KingdomDefense
https://play.google.com/store/apps/details?id=com.ninjakiwi.bloonstd6