Id been playing it (on an iPhone 6s, if thats relevant) and doing well. I was almost through the third chapter and had accumulated good weaponry, purchased extra rune slots, and had banked almost 10k coins saving for another big weapon purchase. The game suddenly crashed and wouldnt re-open. Turned the phone off and back on, still would not open. Uninstalled the app thinking I was safe because I had it signed into GameCenter, but when I re-downloaded the game it STARTED ME OVER FROM THE FIRST LEVEL! Well, I decided to give it another go. Its continued to be glitchy and will crash or not open at all. Im not going to keep putting effort into a game that crashes this often. Its off my phone now.