Here is an overview of the mode, via the Puzzle Bobble Everybubble! official website:
To celebrate Space Invaders’ 45th anniversary, we’re announcing a new game featuring a collaboration between Space Invaders and Puzzle Bobble.
In this mode, players try to erase the bubble-encapsulated invaders by sticking three or more bubbles of the same color together.
Bubbles can only be fired straight up, so players move their characters left and right to aim and defeat the incoming invaders while dodging their attacks.
Up to four players can play cooperatively.
Puzzle Bobble Everybubble! is due out for Switch this spring.
View a new set of screenshots at the gallery.