Endless Space

I love the entire Endless series, would definitely recommend over anything Paradox craps out these days. Perfect blend of complexity and ease of use, amazing UI, pure fun.

What a great potential but totally flawed in terms of balance and AI. I can appreciate that it really has its own mechanics not being another 19352030th MOO clone. Still you can enjoy this game a lot, if you are not too picky on balance/deep management stuff. I would recommend to try it.