It's a classic greed game. Sell a game for a low price then have "cheap" (£9 is the most expensive) in app purchases that you will have to keep buying. By playing you earn around 50 gold coins. New characters and skins as well as upgrades and anything to make the game interesting? Lowest cost and what mostly everything costs is 8000 (the second character is 500). Enjoy the monotone repetition, thankfully Slay the Spire is coming to mobile.