This came out years before 'Galaga: Destination Earth', and actually seems like a more inspired take on the perspective-shifting shoot 'em up. I had cannons that shot backwards, which I could use to shoot pursuing enemies during a sequence where the camera pointed backwards. Neat.
Screenshots marked with 🍒 are created by syltefar and are considered public domain, free to use for anything. If you want to, you can note where you found it and link to this page.