Ok, played the game.
@intro:
well, i didn't understand a word, but i would make the earth way bigger.
The reason why you realize the earth is so tiny is that you can see your moving speed on the basis of the particles in the space.
if you make the earth bigger and increase the distance and speed as well the particles will fly much faster and the feeling of a massive earth is perfect
@game:
great enemy models/animations and a nice interactive gameplay.
There are many features which can make the game interesting.
The music creates a good atmosphere.
BUT: I really don't like the controls.
As i played the game i didn't had the ego-shooter feeling i have in other games, i didn't have the feeling of controling the character, because his movements and the way he fires is too slow.
i would suggest to fiddle with some values.
and someway there is missing somethings, that gives me the feeling, that the weapon i carry really fires live bullets.
Maybe adding blood effects or an animation on the enemy when they get hit would change that.
In the distance i see objects popping up, maybe you should increase the camera distance or add fog.
All in all this game has the potential to get brilliant, good job!