It's Forbidden World that is an Alien ripoff, not this one.

The way I see it, the set design
for the corridors and bulkheads
at the beginning of the film sort
of act as a template for the look
of Hadley's Hope in "Aliens".
Obviously, there are also comparisons
to be seen with the corridors of the
Nostromo in "Alien".
So this is how liberty dies-with thunderous applause?

The only element resembling 'Alien' is the setting where we have a crew trapped inside their Spaceship and they are encountering disturbing creatures. That's it. The theme and message are totally different than 'Alien'.
G-O-T may be a cheesy dime-store Horror flick, but at least it offers an old and timeless philosophical message.

Just watched it, got a Cube vibe from it

If anything, this movie is a near cannibalization of Battle Beyond the Stars in terms of sound effects, and some visual motifs. Roger Corman's sci-fi movies tend to be similar in appearance, or even in visual effects.
"Space Raiders" practically cannibalized every visual effects shot from Battle Beyond the Stars.

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This movie is more of a remake of an early 60's B film, JOURNEY TO THE 7th PLANET, which had the same basic 'monsters from the mind' premise, but was brought down by a very low budget.

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This movie has more in common with an episode of Star Trek especially that ending. Aside from the opening pan shot, there is really nothing ALIEN - esque in this film.
The Corman film that most resembles ALIEN is the 1982 release "FORBIDDEN WORLD".
This played theaters in my hometown as "PLANET OF HORRORS" but the poster in the lobby was titled "MIND WARP AN INFINITY OF TERROR".

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It's clearly an ALIEN ripoff!
You know Space and Monsters and stuff
Just as TAXI DRIVER is clearly a LOVE BUG ripoff.
You know America and cars and stuff

funny thing is. i met erin moran at a convention. i asked her what year they shot this film in? she said 1978.. i said are you sure??? she said yep 1978/ i dont belive it. but then i asked sid haig last week at another convention. and he said it was filmed in 1981.

How about "Sphere"?
That's another Galaxy of Terror rip-off.

The simmilarities to Alien are almost nil.
Spaceship lands on alien planet? Geeee. Like that hasnt been done in about 20 other SF shows long before Alien?
Spaceship crew runs into trouble and/or derilect alien tech? Been done before Alien as well.
Crew encounter things created from their own minds? Yep, been done before too at least once and likely more.
Galaxy of Terror just had the misfortune to come out a little late. Its a fun movie that strikes off mostly on its own path and does it pretty darn well too!

Before saying it's a "ripoff", take a look at "Demon Planet" aka "Planet of the Vampires" aka "Planet of Blood" (1965). When I saw the "space jockey" in "Alien", I immediately thought of the crashed spacecraft in "Demon Planet". Also, the setup is the same: distress call from planet with a foggy, rocky landscape. It has some very stylish and spooky moments. My favorite sequence is that crashed craft with the remains of a gigantic pilot. It's a real standout!
"Alien", as has been noted", is NOT original by any means! When people want to claim "ripoff", it simply shows that they haven't watched enough movies.
I do agree with the "Solaris" comparison and do see likeness to "Event Horizon" in having fears be their undoing.
YouTube has the film: Planet of the Vampires
This is after they enter the craft:
http://www.youtube.com/watch?v=jLM8YF7EaVE
*** The trouble with reality is there's no background music. ***

Marooned crews, dark planets and alien pyramids came a dime a dozen in Sci-Fi books since the days pulp was invented.
And then again has anybody here ever seen PLANET OF THE VAMPIRES?
I honestly hope that you all can accept the idea of Space Gothic as a style rather than a "ripoffable" idea of any sort.
Admittedly it is hard to imagine anything more perfect than the joint venture of H.R.Giger and Ridley Scott though

Howdy,
This film is a mild "rip-off" of the MOVIE 'Alien', i.e. Spaceship lands on dark, desolate world looking for survivors/beacon, and they find something else. Some of the "look" of 'Galaxy' is certainly cribbed from Scott.
HOWEVER, this film absolutely ripped-off the 'Book of Alien', a book published at the same time as Scott's 'Alien' that covered unused production designs, plot elements, etc. In the original drafts of 'Alien', the Nostromo was to touch down to rescue a marooned crew and they would come across an alien pyramid.
A LOT of the interiors, exteriors, and the alien pyramid are cribbed from the designs of O'bannon, Moebius, etc.
Ken

I agree, I watched hearing it was an Alien rip off, also because I was curious to these movies Jim Cameron worked on.
Aside from it being a horror film in space that's basically where the similarities with Alien end, thematically. From set design there are a few obvious Alien visuals.
But the plot I agree the movies Event Horizon and Sphere seem to have the exact same plot.

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Inseminoid was another which had clips in the Tracy Lords "Not Of This Earth" remake intro (along with GoT's worm 'n friend).

I recently saw the version of "Inseminoid" called "Horror Planet", which might be the only one with the cowboy-hat-pilot epilogue. First half is real strong amd mysterious, second is so stupid it leaves a bad taste in your mouth. By the end, you'll be begging for the retarded space-base crew to just commit suicide and spare themselves the embarassment, like you cheer for the zombies in "Burial Ground/The Nights of Terror" to dig into the humans and end the movie.
If you want a 'great' alien-rape-scene however, it is a must-see.
I used to see copies "Galaxy of Terror" all over, but now I can't even find a copy in those rare rental stores that still have VHS. I still haven't watched it! Sucks to be me.
"Oh, I am going to smack you SO HARD if this works, movie!" -Crow T. Robot

Yesterday, after more then twenty years I watched it again. I can see where people would think it's an Alien-ripoff, but I think that's a tad too easy to say. Alien was indeed the only other picture like it at the time. In those days, with Star Wars and all, space-movies were doing very well, but they were all very goody-two-shoes whereas Alien was the first one to really shock the audience in the manner that it did, so if anyone else goes for the same approach, yeah, up to a certain extend it'll show strong simularities. Besides, didn't Ridley Scott (who directed Alien) have something to do with Galaxy Of Terror aswell?
I agree with the fact that the guys that wrote Event Horizon, must've done so after having seen this movie!
Insemenoid? Haven't seen it. Sounds brilliant. Going to do something about that right now! What would we do without sh*tty outdated B-movies?

Your description get it best !
The history of how ALIEN got made, how it almost was made, and how it might have been a work so very different !
In the end, all of these movies borrow material from A. E. Van Vogt's VOYAGE OF THE SPACE BEAGLE, a serialized novel from the 1940's !