The way I programmed it was for the ear monster to check whether the cat is active or not. The cat can still be active while the mouse has been deactivated, because the cat still needs to catch up. And when the cat catches up, then it becomes inactive.
The idea was for the monster to listen for the footsteps of the cat but I don't think I achieved that very well. Sorry about that. Glad you liked the game! I know that it's not perfect and there are many things to fix, I'm still happy that there is something enjoyable to be found.
Have a nice day!