I would strongly recommend you to use the same text colour. In this case, white looks better. The 3D effect is quite good, but you could put it not only on the bottom. Try putting it on left or right too.
If I move the UI’s to the right side or left side, wouldn’t that effect the mobile jump button and move button? (The UI’s are currently on the top of the player’s screen.)
Keep the consistency of using the same colors, the white and the yellow is really high contrast and hurts my eyes. Also, make sure you have good padding, the one you have here isn’t great.
I think it would be more modern if you changed the font to SourceSansLight, changed the text color to like a ton of white which isn’t hard to read and add an UIGradient to the text, then change the UIGradient color at the end to something like dark grey. And maybe make the button colors more light, instead of neon. That’s my opinion, though.
That looks like a nice UI, but like another person said, it looks like a UI for like mostly all obbies, when I join obbies I mostly see that sort of UI. Good UI tho, keep it up!