Surprisingly well done.
When I first pressed the play button and pressed the left key I just told myself, "Rawr, this is just a copy of a *certain game* with more achievements." But, I played through anyway just to see what you came up with. I was really surprised to find that you came up with clever new ways to earn achievements. (I especially liked what you did with the in-game arcade) I would have liked to have seen the game more as yours though. The similarities between a *certain game* and yours are a bit too close and might deter other from seeing what you were trying to accomplish with this. Either way, good job. :D