I did notice this before, and what a crazy looking game. For a game that came out the same year as Space Invaders, Atari created something very technically unique here: a scrolling, 3-bit greyscale playfield in pseudo-3D perspective, something that was achieved by specialized video hardware.
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.