There have been many strategy based android games so far some with the genre of tower defence where as some following the trend of action based strategy, but clash royale is the first game ever to adapt both the tower defence and action genres as of its predecessor Clash Of Clans to recieve recognition by the players.
It is a strategy based tower defence and action game with a battle Royale setup.
I have been playing this game for over a year now and am quite addicted to it.
Pros-
Its gameplay is very user friendly and the first of its kind.
The character cards in the game are very easy to get accustomed to and the concept becomes clear after playing a game or two.
The creators have made provisions for limitless combinations and creativity for the players in the form of different character cards and the option to customize decks.
The best thing about this game is that millions of players play this thus you dont have to wait for 2 or 3 minutes as in case of its other rip-offs to play against any other player.
The creators keep releasing new cards into the game to keep it interesting. There are events also that are organised weekly for the players to participate.
Clash Royal holds its own real time championship tournaments with prize money to encourage and reward hard core players.
Cons-
There are not many cons of this game overall but there are issues with the current version of the game, the rendering of animation sometimes.For example- when you place or deploy a card the character gets in the battle field without its deployment animation being shown.
Another drawback is that the availability of free gems is much lower as compared to clash of clans.
Overall I think this is a great game and would definitely recommend it if you have not played it yet.