Hiiii, first of all i love this incredible asset. But i have a question. How did you achieve this wonderful background? I thought it would be a simple PNG, but actually not. What background colour should i take to get this blue gradient? Is it all done thanks to post processing effects? Im sorry im quite new to unity, sorry to take your time.
You can place over your background sprites a giant sprite of a plain colour, in my case was some blue with transparency, this will give the blue tint the sprites have, then I applied depth of field effect to blur them(post-process) on a second camera that will only render the background. But yeah that is pretty much, you can experiment with other post processing effects like vignette, bloom.....