These are great! A few more of my own:

  What does my reptilian brain "sense" in .5 seconds?
  What can be removed to improve it?
  What is confusing?
  What is offensive?
  What could make it simpler?
  What could make it clearer?
  Which entities are dead weight?
  What is too small to easily read?
  What is too dark/light/unfocused to easily read?
  What questions does it raise?
  How do I quickly and easily find answers to those questions?
  What about it excites me?
  What would it take to excite me more?
  What is it supposed to do?
  Does it do that?
  Who is it supposed to me for?
  Is it for them?
  How do I get out?
  How do I get back?
  On an integer scale from 0 to 10, what is it?
  On an integer scale from 0 to 1, what is it?
  How fast is it?
  What slows it down?
  What should be removed to speed it up?
  When I do something, how do I know it knows I did it?
  Is everything about it intuitive?
  What needs to be made more intuitive?
  How comfortable am I staying here for a while?
  How comfortable am I staying here all day?
  What else should it do without getting too complicated?
  What could be better about it?
  Would my boss understand it?
  Would my customers understand it?
  Would my parents understand it?
  Do I want the past 5 minutes of my life back?