I don't know what's so bad about it, I did it just fine by holding up while moving the bomb, that makes it descend slower, on the first try too.
While I'm here, any tips for the 3rd to last level on extra? (Right path, forgot the level number, maybe it was the second to last one) The one with a lot of colored switches and blocks ,4 (?) Suwakos and only one type of block to use. No idea how to do that one. I keep getting the Suwakos stuck and squishing them to death. That or time eventually runs out.