Interesting
Okay, so first and foremost it's fun. I like that it doesn't require the mouse, because being on a laptop makes mouse-oriented shooters a bitch. This pleasantly surprised me by making use of the arrows. The colors, while somewhat painful to look at after a while, give the game a sharp visual look despite the simplicity of it. I made it through the first 4 levels before biting it, and I'm likely going to try again shortly. While its silence was also surprising, it wasn't a bad thing- it made it more methodical and less run-and-game. While run-and-game was likely more the premise, the methodical feel works to your advantage.
My single greatest complaint is probably also one of the things that made this game so much fun- the ninjas. In a game where the hero is somewhat slower and more methodical, the speedy ninjas made a snap reaction nearly impossible and survival just a frustration. The game is otherwise smooth and in my opinion well done despite the limitations imposed upon you.
Congratulations, also, on making it to the front page.
8/10, 4/5.