I'll give it a solid 8, good graphics, nice idea, though a little lacking in the player involvement. I could foresee a good game if you maybe created an area where the player had to actually build his tools, rather than have the pieces just put themselves together. Maybe change up the enemies a bit in order to motivate the player to switch weapons and such.
Also, I gotta say to the kid who didn't know what a microcosm was, try dictionary.com before you spout off about words you don't know. Jesus...
Anyway, nice little game you got here