This is free art – it is under a Creative Commons Attribution License.
Type: iPad, iPad retina, iPhone retina, iPhone, probably most Android devices as well.
Download the art here, or read on for an explanation.
To find the full list of images, which includes a koala, an ant enemy, blocks to build the levels, scenery and obstacles, read the original post: Free Game Art: Super Kuwalio!
You will have to resize these sprites so that they fit the screen of your device appropriately. You will also need to generate your own half-size versions for iOS devices. If you need an image resizing app, here are my recommendations.