Hey welcome from Steam! The swimming creature is just a secret, I kinda got talked into doing a lot of stuff for this game so there might be a few open-ended ideas like that. :S
Thank you for your support!
Is good to know I'm not losing something around the creature :)... thanks to respond my question, I think might be good if you make a type of interaction with the creature, for a time I was thinking my game was bug or something because the girl just feed it with no saying nothing and no type of interaction or dialog when you click it. Just that. I love your game!