Unfortunately the program we're making the game in doesn't support multiple scrolling backgrounds, also called parallax. It does however have a few extra shades of blue in the background by using the copper effect.
Parallax usually requires the Amiga to fall into dual-playfield mode to do realtime overlays. That would cut the maximum (non copper-enhanced) palette depth to 16 colors in the foreground and 16 colors in the background on AGA.
I'd say it just looks pretty but doesn't add to the playability of the game.