You make a lot of valid points on the UI! I meant to have something for the active button states (like a hover effect of some sort), but ran out of time and didn't add anything which does feel a bit weird I think! Same with tooltips. I also wanted to include a tutorial but ran out of time. But those are all things that I think would greatly improve the experience if they were implemented!
Also thank you for the feedback about it not working in Duck Duck Go! I had no idea it wasn't working in there - might need to test it in other browsers too, and figure out how to fix it after the jam.
Thank you for your kind words and detailed feedback, I appreciate it!