Regarding my animation, I used animation player node. Every single incubator destruction involves calling a function from each of the incubator, which plays an individual animation player from the incubator -- I had to do this mainly because of the sound during the incubator exploding sequence and the particle they emit... so to describe it simply it's 1 animation player calling for 40 other smaller animation players to play their animation. Darn now that I put it like this I just realized darn yeah this is probably extremely inefficient :O
And then regarding the ghost appearance... lemme tell you that the scene you described is not the first time the ghost appeared. The ghost actually also appeared during the "normal, cheeful" section once although just for 0.5s (again, check the screenshots that can be seen in this page) :3
