Issues with low resolution

Appulocity

Ive made a couple of games recently and they look just fine in the preview, but when I test them on an iPhone 5s the graphics appear blurry and low res for some reason. I made the games for portrait iPhone 6 and in publishing set it to overscan, however that can't be the issue because the actor using the display text behaviour appears just fine. Any thoughts as to what the issue could be and how I could fix it? Here are a couple of screenshots showing it, with the actor using the display text behaviour circled in red.