I really think Capcom should have created a Level Editor for this game.  This game is just begging for a level editor.  Don't you guys agree?  After playing Endless Attack and Special Stage, it's pretty clear that these "new" levels really feel like someone was just messing around with a level editor to create these new levels using all of the pre-existing game elements.

I just love this game.  I think it's better than 4-6, but not as good as 1-3.