This is a really clever way to show the game jam theme. The game concept was fun and pretty unique. I think the UI could have been a bit easier to read. I didn't personally struggle too much, but blue and white text on a mostly blue and white background is a bit rough and sometimes stream messages disappear into the background a bit. I thought the content that Doki reacts to was funny and I enjoyed the stream chat and names. It was fun!
(Side note: Nice work getting an Unreal project to run properly in the browser. I always see a lot of people struggle whenever I look up troubleshooting advice for it, and I've had times where I can't get it to work well.)