Since the screen isn't big

I'm playing on my smartphone screen, so I'm having a pretty tough time with the larger stages. I'm trying to use zoom as much as possible, but sometimes it registers as an unexpected accidental tap, and I lose hearts... Also, there are times when I can't zoom out any further, leading to accidental taps when moving, orz. It really varies depending on whether the input is responsive or not, making it quite difficult... What kind of devices are you all using?