I'm going to be blunt: there is nothing special enough about 'Creature' to make it memorable, or to watch it in the first place. You will be far more satisfied watching 'Lifeforce - also released in 1985, with a similar-ish premise, but far more superior. Alternatively, rather watch 'Alien' or 'Aliens'.
A Group of young scientists go on a research mission to explore an archeological find of alien origin. From the very beginning, there are authority issues between the crew members, and constant disagreement. Most of the characters are not fully explored and I found myself not rooting for any of them.
The sound - especially the dialogue - is surprisingly crisp and clear. The practical effects are rather good. The visual effects are mediocre. The lighting is exceptionally bad, making the film very dark and difficult to see at times. Even the good practical effects are shrouded in so much darkness, rendering all their hard work almost worthless.
The creature design is very bad. The creature is a lifeless blob that was difficult to see with all the darkness. One only really gets a glimpse of the creature during the film's final moments - looking a lot like a cheap rip-off of the 'Alien' creature.
'Creature' is a slasher film that follows the same recipe as almost every other alien creature feature, offering nothing new. On the contrary, it is cliched, and with the bad visuals and lighting issues, it might be best to give this one a skip entirely.
Would I watch it again? No.