First one shouldn’t bounce back in after leaving. The moment it’s gone the next UI should come in. It’s an unnecessary use of bouncing for the sake of it and it detracts from the experience in my opinion.
Second one shouldn’t exist.
On a positive note the big buttons are nice. Very friendly for visually-impaired, or mobile users, or just people who like big, obvious, appropriately-coloured buttons.
Imagine being a new user to Roblox and every game kicks you for the first 10 days. It would instantly put people off playing. Age kick systems are a truly terrible idea and if you’re asking for user experience feedback, my feedback is that they are a bad idea and horrible practice.
However, the concept of a modal popup in the event of something happening (whether that’s a kick, or a bit of info) should not overlap like that with other parts of the UI, especially parts that are no longer of use. I usually have modals with the highest ZIndex and have a 50% opacity dark layer below it to bring focus to the modal only
These UIs you have designed look fine, although I would recommend the “bounce” in the first video be removed. I would also suggest changing the font of the text, and slightly change the background colour of the UI.
First gif looks nice however white outlines looks a bit odd. Maybe for orange ui this could be a darker orange. For blue button it could be a darker blue etc.
I don’t think kicking underaged accounts is a terrible idea for your game because people wouldn’t want to wait 10 days to play a game. If you are really sure about it then the tutorial ui should bounce back and the kick gui should bounce in after it bounces back.