Not very good. First, you really need to tell people that they have to click then click and hold. If you don't do this it tells you that you failed because your mouse went out of bounds. Although you don't introduce performance until the second level this still impacts your performance on the first level even though you have no clue how the game works. That being said when you actually go out of bounds nothing happens, the levels can be won perfectly by simply dragging the character off the screen. The text color you use combined with the background color you use makes the text in the game practically unreadable. The levels themselves are clunky, there is no finesse or style in the design, if the boundaries actually worked I think some of these levels would be practically impossible to win. The objects themselves make little sense just randomly hovering in the air, granted you are a box, but this could be solved (along with the boundaries) by having the dive take place in some kind of a tube/tunnel/well/mine shaft. Overall this thing needs a lot of work to be any kind of fun.