What's wrong with overpoweredness? Overpowerdness by itself isn't a problem. It's just how its usually handled. With good handling, all sorts of OPness could be more fun to read. Just look at Gu Long's signature cast of characters and point out one of them that isn't totally OP.
Alright, some CnC from me.
You first sentence didn't really do very well for me. For an opening line it was too long and could be difficult to understand. You have to draw the reader in with short, suspense-filled, easy-to-read, and generally interesting first sentences. In this age, it is no longer possible to draw readers in by showing off how many words you know; people don't want to see that, they want something that's simple and fun to read. So I suggest cutting it into half; instead of []Space spread out like a massive black cloak, dotted with innumerable worlds, the names of which now fled the memories of nearly all intelligent organisms related and including humankind.[/I], I suggest it be Space spreads out like a massive, dotted cloak; a vast black cloak dotted with innumerable worlds. And what was that throw-off line in the back of the first paragraph? Throw off lines should be short and witty and interest the readers, but, frankly, that sentence was neither. Do any of us care about microorganisms in some unnamed planet if they have nothing to do with the plot?
The sentences in general just weren't very engaging. I don't want to go over the problems in each one, but they didn't take direct paths to convey their meaning. It seems to me that you were trying to squeeze as many words out of the least thought. Why did you have to say was still surviving when still survives could have meant exactly the same thing? Remember, having the most words doesn't necessarily make it the best story ever. The best works are judged on how much meaning they can convey over the least words. Try to cut every sentence to be brief, and to the point.
I'm sorry, but I just couldn't read much past the second paragraph; I was tired and just couldn't push myself further anymore. Maybe I'll come back to read more of it and offer more advice someday.