I love the artwork, the animations are great (although I don't understand why the ghost shrinks when charging up for the heavy attack?) and the music was also wonderful and fitted the game very well.
SFX were a bit lacking & it was a shame to see no visual feedback when hitting an enemy. Also the very first issue i ran into was after first loading up the game, I tried to click in the middle of the "HELP" button to see take a look, and instead clicked the EXIT button which quit the game. This was because you can see that the actual button are far far bigger than the images, so they don't match at all. I think on closer inspection this is true for all the buttons in the menus as you can see an outline of the button when you click them.
So overall art & music are really good, SFX are lacking and the mechanics / technical side need tightening up to make the most of a promising idea.
Keep at it guys.