This is unavoidable. The engines are not 3D volumetric objects, they are just flat images. At some point you need to invert the drawing order to make it look “more correct”.
No, indestructible enemies do not spawn keys. Which wave is this?
1 . What about adding some musics and back grounds from editions from the last episode which are
Chicken invaders 3 : Xmas Edition theme music
Chicken invaders 4 : Xmas Edition theme music, thanksgiving edition back ground
Chicken invaders 5 : Halloween Edition Back ground and these music
2 . adding a halloween design for Both of the Yolk-Star and Egg Cannon like the henterprise like the henterprise with some strings?
Maybe, if xBendy posted a bigger image or at least replied we would’ve solved it easily.
I don’t know it’s kinda like asking a mirrored version of “Raise the Curtain”, not necessarily, unless you meant a upside-down version of it, besides IA said he’s done with mirrored waves, meaning he won’t add anymore, so try ask him after a few updates.