Edit : Following issue has been fixed.
Just a heads up : this is listed as compatible with phone browsers, but doesn't scroll vertically, putting option(s) out of reach.
Edit : following issue has been fixed.
The game has been updated to be playable on a phone, but the prestige system access wasn't programmed to be scrollable and extends beyond the bottom of the screen. The expanding menu navigation options that appear as you unlock features also "push" elements off the screen elsewhere - after the first prestige, the scroll box extends below the screen far enough that the newest upgrades are always inaccessible.