This is quite an enjoyable game but it also has it's downfalls.
It's no good when a game reminds you of another game, thus giving the impression that the maker of said game has ripped off the other. A particular game comes to mind with this one; Cut the Rope. Very many things give away Cut the Rope in this game. Firstly, the name of this game. "Slice the Box". Three words, very simplistic and to the point. Second, the music. The music sounds almost exactly like Cut the Rope. Very playful and "bouncy". And third, the colours, the background, overall how it looks.
One more thing, the controls are a bit sticky. When I attempt to click to make a cut, it takes me three or four tries just to get it down, I would work on fixing that.
Your game isn't bad, I like it quite a bit but next time I would advise attempting to use your own style rather than that of a widely known App/Game. You have the talent, apply it in your own unique way!