I stand by the comments of Airy and Beebster. You give the mission what to do but now how. Don't assume that other people know the genre and its possible standards as good as you. Make an intro page or give more info about the controls, for example.
The models and animations were good, the game had a certain flow, SFX and music were ok. Though, I did not see the theme as it seemed to be a typicial tower defense game with waves.