It looks pretty nice. It would be even better if the PNGs were resized (or just added padding) to be power-of-two sizes. Unity, for example, won't apply the best compression unless images are pow2.
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Thanks for your comment Tom. I have used Unity for a long time and from what I understand for UI elements, the power-of-two requirement is less critical. These elements are typically not mipmapped and might not benefit as much from certain types of compression.I usually provide icons in pow2 sizes but not the other UI elements as these free UI packs are mainly created for new devs to understand and implement into their projects more easily :)