Not too bad
I give it 3 stars due to concept and such. However graphics obviously could be better, and you could defiantly use a better hit area for your buttons other then the text. Need to flesh it out more as far as a story, and obviously as this is a preview I'm not degrading you on this.
I look forward to seeing a better fleshed out Ninja 1 (perhaps a better title too.) in the portal later.