As of this writing, E7 is ranked #18 in South Korea, #37 in the United States, #32 in Australia, #23 in Canada, #8 in Singapore, and #30 in my country, The Philippines. And it's speculated that it will rank higher when it releases its first collaboration with the Japanese game Guilty Gear Xrd REV 2 next week.
Unfortunately, the game is not yet available in China, one of the most targeted territories when it comes to games, as the number of gamers there is truly massive, just like in South Korea and Japan. Speaking of the Land of the Rising Sun, the game will be available there soon, as it was recently announced that it's going to be published by Yostar Games (Azur Lane, Nono From Another World, Arknights).
Current features of the game are Arena System, Guild Wars, Dungeon Raids, Character Side Stories, and many more. Future planned updates are one-on-one PvP (where you can choose any player you know to have a match with), Pet system (to help you open the treasure boxes automatically), and auto-repeat feature (to lessen the effort of the players on clicking the same button again and again).
If you would like to try this game, you can download it on Google Playstore or Apple App store. You may also follow Epic Seven on their Facebook, YouTube, Twitter, and Instagram accounts.