Imagine Xcom, but where you only have one enemy type, and play the same mission over and over again. Now splash in a management system that's on par with your standard clicker game.
The first two hours were fun, then I realized I've done and seen everything the game has to offer. By hour five, I was super bummed and wanted refund, but alas, I was too late. RIP $40.

Not worth the purchase, unless they add some major (and free) content updates.

((UPDATE))
After looking through the Upcoming section of the Steam Store, I see that there are already TWO DLC's available for purchase. DLC pack 1, for $10, DLC pack 2, for $20.
I'm astounded by this. I was so amazed, I had to update my review just to point this out. Already prepping to sell you DLC for a game that's currently an incomplete garbage heap. So glad I didn't end up getting conned into buying a 'season pass' or 'complete edition'. Now I'm happy I only wasted $40, rather than potentially $70 or more.