The task here is to aim and shoot a ball across each level so that it hits every bit of white geometry in one go.
There's a slight musical touch added as each shape chimes upon being hit. So, ideally, you'll create a neat sequence of sounds upon success.
Not only is Okay? quite neat to play, it has an experimental payment model, too.
You can download the game for free on the App Store. However, after 20 levels you'll be asked what you think the game is worth.
At that point, you can choose from a range of prices and, if you wish, decide to spend the money to show your appreciation of the game.
As its creator says, "It is like a shop where the owner is on vacation, but placed a collection bag on the counter. You get exactly the same game for $0 as for $8.99."