It was probably supposed to say/mean Easy instead, but because of the many typos in the review, it (among the others) was perceived by the Newgrounds-user D-Mac-Double in a more flavorful and funny taste, spawning the popular audio-clip "Dot Dot Dot", later being the basis for the even more popular flash-movie "Dot Dot Dot - Animated".
D-Mac-Double pronounces the word as "Es-sy" or "S-sy".
It is related to the words beacuase, athore, stranth and reley, among others, which originates from the same sources.
this game is so esey. i mean, all you do is hit the spacebar. thats it!" ~Axman13