No clue yet, I'm working on UI right now but there is some tricky stuff there because the main menu background is actually an animation something I never did before for UI. The game over screen is done though:
Your UI looks fantastic! I barely gave any attention to UI. I remember how on the day before we had to submit our games to the gamejam I was like "wait, I don't even have a menu" Hahaha. So I just crammed in a bunch of stuff I learned at the last moment.
It's definitely the last thing I think about, but I remember when I saw that the assets I used for gauntlet came with UI assets I thought I should probably set one up. It really polishes up the player experience.