To be frank, Atari's galaxian is lacking a little in audio with some inappropriate sound effects, and the commanders are the wrong shape. But it's amazingly playable and I think that's what they developers often got right.
I played it to death when I got it on cartridge. A different experience to the arcade granted but still a great game.
For me, galactic chase was washed out visually, slow, and the sound effects were somewhat grating. But this is only my opinion.