Here are some things I noticed after the fact:
1. I naturally wanted to finish the presentation and was compelled to click to see if there were any amazing insights.
2. After the fact, I have no idea how I even advanced the presentation, all I knew was that I clicked something. It was 100% natural.
It fully pulled me in. I can't remember if there were ads on the sides or more information.
[added] I went back and looked at it again and I think what made it so flawless is that the first page gave me no option but to click the right hand arrow which taught me what to look for. I clicked the right arrow, and then I knew to click it again to advance. The progress dots on the top let me know that I didn't have much time left. Really amazing work here.