(I put the same guide in shape shifter 2 here)

When you finish the level, each character takes a certain amount of time to enter the door.

Mouse: 0.800 - 0.833

Elephant: 0.967 - 1.000

Rabbit: 1.967

So if you want to complete the level faster, switch to the mouse as quickly as possible so that the animation of entering the door doesn't last too long.