bro, you need really to work on your marketing!
The video doesn't explain anything! It's only a bunch of effects and sounds!
Take a day and learn how to make a simple video, cut the best scenes, show your different monsters and bosses, write it on the screen... put an intense music to fit the game art on the video...
and after you do it, make an update so the Google Play and the App Store can bump it a little bit...
and at the end, you will try to advertise without a budget... so try to find people / communities who like to play this type of game and show it to them!
But remember, before you do it, please improve your page, video, screenshots! :D