Thanks for your feedback!
I changed the welcome message to:
Welcome to my WordPress.org user feedback survey that I created for a task for Google Code-In. Please answer the following 30 questions to the best of your ability. This survey should take no more than 5 minutes of your time.
(I timed myself taking the survey and got that it took me 2 minutes)
For the Likert scale, I added the following help text below the question:
1 is I have no skill in this area and 5 is I'm a master in this area
The questions with "Other" weren't mandatory (none of the questions in the survey were mandatory), but for some reason they require you to fill in the text box if you choose "Other". I'm trying to figure out how to fix that right now.
As for the meter, I am pretty sure I have no way to control how it shows. What I've done is added a "Page x/5" under the heading of each page so the person filling out the survey has a more accurate understanding of where they are in the survey.