Yep, you can make the levels with an Amiga paint program, as long as they're using a 16 colour palette, and the 0 pen is transparent, so 15 colours can be used.
I have never owned any of the newer games so I just never had a way to rip the levels myself, I just thought it would be a cool idea and I'm glad someone has done it.
Oh, and there's a feature where you can have foreground and background layers in the landscape, so you could have a landscape of a lady with a bikini on and when you blow it up you see what's underneath.