If you don't see any choices click the word "continue" to move the story forward.
Clicking anything but the choices and the word "continue" will toggle a loop until you actually pick something.
Yeah, that's the idea. The different color speech bubbles simulate a conversation by text message, of course. (Supposing you have an iPhone rather than an Android phone.)
You can ask Jens (or just wait for him to read your post), but my guess is no, because he wants this to be simple to use, and having lists of alternatives (i.e., menus) is already hard enough.
uh, no. I'm currently developing the story for the "game".
you can use the project as a base for whatever you want to create with it.
as long as you credit me somewhere.