I was providing some feedback on a peers design. And what kept jumping out at me was the fact that these buttons seem to blend together and appear sort of as a block of text to me. This is a native app however these buttons are not unlike ones you might see in any responsive design. 
Is this a valid concern? If one shows a list of choices as buttons on a mobile device do they tend to blend together visually?
Part of my reasoning for doubting this concern was due to the fact that i don't know how to fix it other than adding some more space but that would make the surface area for touching smaller.