You have to admit, the MOUSE-O-MATIC-O-MATIC catches your eye. You keep trying to distract yourself with new weapons and beam experiments and explosions, but the memory of Mousimilian's heroic death nags at you. Even though he was just a mouse clone, you really got attached to him, especially since he gave his life to save you. Maybe it's time to think about a new furry companion?
But no, you still can't do it. It would feel too disrespectful, like you were trying to replace him. He's only been dead for like 10 minutes, have a little respect!