I see, I didn't know that was the toggle to change the controls. It's really difficult to control (but I assume that's tied into the theme of an arcade game). As for saving, I'll have a look at something as I have a suspension it's related to using a "work profile" as a second account on my phone.
Edit: I was being silly. I'm used to renpy apps, so I forgot that your apps require you to press and hold to save or load.