I enjoyed this! I think it's a pretty cool idea.
Since you asked for thoughts, I have two points that came up for me while watching:
1: The text is small. Even with my settings at 1080, I had to lean in a little to make sure I could read everything. Blowing it up to full screen definitely helped, but I'm one of those guys who typically multitask and keep youtube videos their native size
2: The spacing between the text bubble and the video. Because they are at a diagonal, I had to constantly shift my gaze diagonally to read, as well as see what you were talking about. While this may not seem like a big deal, it isn't as natural a movement as left to right or up and down. So my eyes got tired pretty quickly, coupled with the reading.
Again, great job!
I look forward to more.