More is visible, and it might be scaled adequately for some phones, but it's still cutting elements off on mine. (Opening the game forces landscape mode. I agree that portrait is generally the superior option.)
Good luck. This might help :
https://www.w3schools.com/html/html_responsive.asp
As is, I have a button to add a bit, and one to reset the game entirely. I chose fiat, if that matters. (Although the reset doesn't let me re decide what to peg the value of my currency to.) No way to spend bits.