Spent 2 months in the game. My verdict is that the game is bad. You will spend 90% of your time in the main screen. You will collect power-ups, play mini games and watch ads (a sea of ads) to get resources. I experimented a bit and realized that the game is extremely tricky: 1. auto levelling of enemies (i.e. you can spend dozens of dollars on cool equipment, and the result will be minimal). I purposely didn't go through the "story" for 2 weeks. Improved my scores by 2x. And still I also get beaten at level 30. Exactly the same place. 2. the game sees what resources you lack, to further improve your equipment. And it purposely doesn't give it away. For example, I spent 3 weeks to improve my level 2 purple katana to a yellow katana. And I played very actively and very much bought chests on green crystals. However, I was only given useless junk. The game looks decent and even the donation seems easy, but "under the hood" very not beautiful things are going on. Don't waste your time on this. Mobile gameplay died with the advent of microtransactions. Everything is done to keep you in the game and that you spent either your time to watch ads, or that you spend money.
Dear player, we are sorry that we could not satisfy your gaming experience. We value every player's opinion and will continue to improve to provide a better gaming experience. If you have any suggestions for enhancing your gaming experience, please feel free to share them with us, thank you for your understanding and support.