Thanks for your feedback! The doubleclick represents the "doubletap" action on Instagram, the way users "like" posts in their feed. I wanted to create a sense of intent for players to acknowledge the photos the way they might while browsing social media.
I have noticed that the HTML build is a little buggy with the click-and-drag object interactions. It's inconsistent for me, so it's been hard to reproduce. Sometimes restarting the page helps, it seems. I may poke around to see if I can find a way to make that interaction more predictable in the web build.