While a little rough around the edges in its demo stage, Piko Piko is a nice combination of cutsie anime style and giant hammer based violence. The variety of unique characters help to give the world that extra bit of life, but don't overshadow Piko herself, with her big red hair. I feel the controls could use some work, as I had some difficulty surviving what I assume were boss fights, but the gameplay still had a nice feel to it overall. This has potential to be something really good, so I wish you good luck.
And good job on what you've done so far.