@Vanilleon, re: flying Igor
I'm pretty sure you only need three bombs (which can be achieved with either

or BoS+

), and they can be blue or white. Maybe if you have five to seven, you can actually use green or black ... but once you reach the top of the screen, you'd probably run out (unless you have something to land the mines on). I don't see how

helps, either; I don't think it is necessary.
I think the fireball can kill you no matter what. He can kill you when you have

, can't he (although it usually goes away before he gets to you, anyway) ? And I've seen him go literally outside the screen in the past, when he's turning around. I say he can kill you outside the screen, even if nobody/nothing else can. But it is worth risking a life to find out for certain. If I'm wrong, then flying+

, as Jon said, would equal infinite score. (

wouldn't help, since you can't ever land on top of the level.)
@goncaloo: The Carrotian Council tells you that shortcut ... if you listen to them.
@Neko: You're right. Fruits treat a platform with spikes on it exactly the same as a normal platform. They don't see them. Since apples, bananas, apricots can walk off edges, they can likewise fall onto spikes.