Creating a valid simple design is always more difficult than creating a complex one.
As wiser men than me always say, you should work on subtraction, so that’s what I did with Journeyballs user interface. Here is the new main screen revamped UI. The background depends on the last played level, and the “quit” button is automatically removed on iOS (since, as the wise Mr. Fabian The Spoon Smith reported, it’s not allowed). I like it, for now.