Two Bowls

Glowing arch: walk in and see what happens.
Round plate: held down while a cat or a crate sits on it.
Camera: records which way the cat went.
Green door: open only while every plate is held.
Cyan bolt: stays open once all plates go down together.

Breakfast is under one of the two covers. Nothing strange here: the fish is already in one bowl. You simply have not looked.

Arrow keys or WASD to walk. R restarts the level.