Hi, so I was bored and made an android build.
All of the buttons are invisible, refer to the image. Why are they invisible? Because when I was trying visible buttons I could not read the text properly and I think this looks much better.
https://mega.nz/file/Y3QEDYpT#VqVxvRrxVQ1GR9a1al62BuvBJdhAH9brvnecVq74E2A
EDIT.1: small update, input is registered even outside of the screen (very common miss click on devices that are not 16:9)
EDIT.2: pressing inventory will now also press C (mostly relevant for version 0.6)