....How do you know about Mech Arena?
I suddenly saw the game in Google Play. It was a recommendation from Google, and it was available for installation.
Because I love games like this (moba, competetive pvp, meches and sci-fi style) I started playing ))
You know, the game, graphics, game conception are really awesome ))
I was wrong, and it's not a bug. If you go to settings, you can change Control layouts: here
So the location of the battle button depends on your choice: phone or tablet.
Thank you for your kind words! And this isn't over yet. We are working on many new exciting features that we will implement in several months.