The demo was really fun!
After getting used to the mechanics (and slightly grinding. XD) I finally moved on. At first I was just trying to get used to touch controls since I was playing the mobile version, Then I found out about fusion and that was really cool. sadly I never had time to experiment with the arena mode.
I would definitely pick the android version. Its probably one of, if not the best mobile game I've ever played. and is perfect for passing time when you're waiting for some water to boil or using the bathroom XD
to wrap this up I would definitely recommend this game and I can't wait for it to be finished!