Okay, to answer your question iOS device need 2GB of RAM to run the game while Android needs 3GB. You can run the game on mobile devices with less RAM, but you'll face FPS drops, lag and crashes, although the game is playable ?. Lastly to answer you question on why iOS needs less RAM please click here.
Yeah, War Drum Studios are porting the game to mobile devices. And they're doing a great job, check out their YT channel ?