Hello!
- If there is more than one clickable non-UI element available at a time, that would count as a choice.
- Line-by-line style reveal links are fine, as long as the link to reveal new text is the only clickable element on the page (aside from UI things like menu/saves/restart/etc)
- User input for a player name is fine, and will only count as a choice if it alters the story in some way (i.e. branching or variations in the text).
Hope that answers your questions!