It is very difficult to clear the chocolate and two-layered icing that block the pathway for the ingredients, not to mention there are six colours in this level.
Also, sometimes the game will start off with inconveniently placed ingredients (in the 2nd or 8th column). If that happens, you need to switch it twice. With the pair of cannons, this is no longer the case.
If you are careless enough, the ingredient may fall into the stuck zone, making the level even harder to pass. It also does not help that there are a lot of stuck zones.