I am playing this game on my iPhone using Chrome!

 But when I close the Chrome app, all game data is lost.

 I've tried safari, firefox, and other browsers, but all have failed!

 Can anyone please help me solve this problem?

I dont play on Iphone so i'm not sure why your data is lost. But after you clear a floor the game give you a code which you can copy and paste it somewhere in case you lose the save file you can still copy the code to load the game (beware that you still can lose the progress you made in the middle of the floor).