Designing the user interface
Think about when you are reading a book, the text or images are on the center of the page, the page number is located, usually, in a corner, and the pages are numbered consecutively. The whole process is pretty straightforward and hassle free. Players expect the same experience, not only with gameplay, but also with other on-screen elements such as the UI. The design of a UI requires considerations of a number of things. For example, the platform that you are designing for has limitations, such as screen size, and the types of interaction that it can afford (does it use touch or a mouse pointer?). But physiological reactions that the interface might give to the player need to be considered, since he or she will be the final consumer. In fact, another thing to keep in mind is that some people read from right to left in their native languages, and the UI should reflect this as well.
Another thing to keep in mind is that if you are designing for multiple devices...