Oh man, seems you got no idea how much this mobile phone app thing has been debated and discussed in the past.
Puffin is basically a browser and yes it can be used. Besides puffin there are many other flash browsers. Unfortunately since I have been out of game lately I’m unable to remember names but I personally used UC Browser with flash application downloaded from a trusted 3rd party. I have not just moved armies but have won entire eras using it.
Talking about specific BD app, maybe then you should try battledawn earth arena, it’s a different game developed by tacticsoft but it is loosely based on BD principles.