With the FB Ad campaign over, here are the results of the whole funnel. :)
Impressions: ~30k
CTR: ~3%
Clicked "Early Access" button: ~12%
Filled out the survey: ~12%
Agreed to a call: ~42%
Overall I'm satisfied. The next step is to complete the Beta version (scheduled to be released in August), and run some more campaigns. I also want to focus on creating some content, a few blog posts per month.