There should be a comma after this point. Any introduction clause that's four or more words long needs to have a comma separating it from the rest of the sentence. Weird rule, but the longer an introduction phrase is, the more it tends to blend awkwardly with the rest of the sentence if there's no comma. As in, the reader keeps going, thinking the clause hadn't ended when it might have a few words ago.
The tall Gigantic creature had wings as hard as steel and were as shiny as silver.
First off, I'm not sure why you capitalized "gigantic" here. It's not a proper noun, so this isn't necessary.
Second, you'll really want to avoid repeating yourself because it causes the rest of the sentence to feel awkward, rather than actually emphasizing your ideas. In this case, "tall" and "gigantic" actually mean pretty much the same thing. The thing is big. Telling us that twice feels like you're pounding it into our heads, really.
Lastly, you may want to turn this into a compound sentence. Because the subject is "the tall, gigantic creature," saying "were as shiny as silver" implies that you're saying not only that there's more than one creature but also that they're all shiny as silver. In other words, this is what you're actually saying there:
"The tall, gigantic creature were as shiny as silver."
Alternatively, you could remove the "were" so you're not adding in another verb an implying that what's after it refers to the subject.
It had huge muscles it was as if the creature was a body builder.
This is actually a run-on sentence. Notice how adding a period after "muscles" creates a completely new sentence that stands on its own?
The Creature came closer and closer,
No need to capitalize "creature" here unless its name is The Creature. Secondly in the grammar department, try replacing the comma with a period. Notice how you get two full sentences as a result? It's really another run-on there.
Also, you never mention to what it's getting closer, but I'll talk about plot later.
The Abnormal, Inhuman
Another case of not only random capitalization but also redundancy. "Abnormal" and "inhuman" pretty much mean "weird."
Also, they're what I call "soft" adjectives. As in, they don't really paint an image of what the creature is like. Rather, they simply tell the audience that the creature is inhuman and leave it at that. You'll want to avoid adjectives like that because you want the audience to get as clear an image of what you're talking about as possible, and they can only do that if they can see (i.e., imagine) the monster doing something that would make it abnormal. In other words, instead of simply telling us it's abnormal, show us more of the monster. Show reptilian claws and a face that isn't human. Show each building it knocks down and the people fleeing in terror. Show us habits that couldn't possibly make it human, like it drooling on a building or something. Just give us something solid that touches on the five senses instead of just telling us it's not human.
Creature swayed side to side like a tree on a windy day, it stomped its feet like a heard of rampaging elephants.
Another run-on. Also, be careful about homophones. Heard = to listen, to hear. Herd = group of animals.
You pretty much get the idea.
Basically, I get the feeling you wrote this in the reply box, which is something you really want to avoid doing. Remember to take your time and proofread, and if you're not sure, Writer's Lounge in Pokémon Fanfiction & Poetry has a thread called the Beta Thread. Get in touch with someone there who can help you go over your work.
In terms of description, it's a start, but it's really lacking. You rely on repeating yourself, which softens what you're saying. Additionally, you rely on showing instead of telling, so instead of really getting an image of
how the monster is abnormal, you tell us. Both tend to really screw up description because they're not giving us an image of what this monster is really like. (Even being redundant tends to soften the description, causing us to feel as if the monster is a bit more cartoonish than it should be.) Focus not only on imagery (description that covers the way something smells, looks, sounds, tastes, and/or feels) but also describing what this creature does. You tell us it's knocking over buildings. Show it slamming its side into a building toppling it. Let us listen to steel scream as it bends, glass shatter, and the people screaming. Stuff like that can put images in our heads, so we feel as if we're right there in the middle of the action.
Lastly, while it's a sketch, there's not much here. It'd be more interesting if there was more of a story. You don't even tell us where this is happening until the last line, so we're pretty much left in the dark as the monster randomly rampages around a city that randomly and conveniently appears for it.
In other words, as I've said, it's a start, but you'll want to take your time next time around. Good luck with future writing.
(And I'm afraid I don't rate out of ten, so.)