Its really enjoyable and quick, the combat is simple but works great and everything works great. But, there are some things that would make it all perfect
First, dial down the amount of ads a lot, it hinders the gameplay and to receive a simple reward for winning I already have to watch an ad, not to mention that it crashes very often if you try to claim multiple rewards after each other.
Second, add an option to play with a friend, and add all the weekly challenge gamemodes to be options in normal play
Then, the game would be a mobile masterpiece