Screen resolution is blurry for android users unless they exit fullscreen

URL of experiment:
https://pavlovia.org/run/Hunter/ols2_touch/html/

Description of the problem:
the screen resolution is blurry for android users (not laptop, PC, or apple users) - can be fixed by exiting fullscreen mode but this is a big ask for many participants who may not be tech savvy.

Does anyone know a way around this?

Cheers