Cover art of a game doesn't have to be up to par with the artstyle of the game. If you check the video game cover arts on the internet you will see that most cover arts are illustrations or heavily edited 3D art. Why would i put a ss on cover? Besides i uploaded screenshots to the page as well, so that people can see what my game looks like before playing it.
I agree you about the combat mechanics, i'm not satisfied with the end result myself. 3/5 is a generous rating, i would give myself probably 2/5 for overall rating :) (Maybe i'm too harsh on myself i dunno)
Thanks for playing my game and for your comments!