Some of the things are needed in order to make others. Some of the weapons are like this. I think the cat spear is like that. You have to use some random things to make other random things to in turn make that weapon. I don't remember them all though. Rgarding the missiles thing, there's an interesting bug or something where if you die or have to start the level again for whatever reason, at least in 22-3 is it? Where you spawn right where the missile starts, and it's going the wrong way. So you have no choice but to get hit right as the level begins. It's not supposed to happen like that since it normally comes from the other end of the stage toward you.