Each item has a relevant description & examples.

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The font of the main text is responsive and more than 16 pixels
High
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Site is well-designed for both the vertical and horizontal positions of the phone
High
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Buttons have finger-friendly design, too
High
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Clickable elements have finger-friendly design
High
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Depending on the field, the corresponding keyboard opens up to users
High
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All forms are shortened to the minimum: the fewer fields, the higher conversion
Middle
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All active elements can be easily reached with one hand
Middle
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Accesses to the phone functions are requested only in a context
Middle
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All images are of the highest quality; no pixels are visible
Middle
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The product image occupies 60%-90% of the screen
Middle
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Texts on images are easy to read. They do not blend with the images
Low
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Autocorrect does not work while users is entering data in the fields
Low
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The design of the application is the same as on the screenshots from the App Store/Google Play
Low