So soothing, so smooth, so pretty. I really like the design. The Coil bonus is also nice, especially the extra slots for treasures and artifacts. Having the game calculate your earnings while offline is also a nice feature. However, for the sake of monetiziation, you probably want to give the player extra incentive to be in game as long as possible. Then you get more (real) money from the interledger. That being said, I think the game is polished and top notch. Good work.
I am not sure if it is intended or not, but I lost all my treasures and money after activating an Artifact :P I think it was intended, since the main character said something about Deja Vu.