It's not a problem! I am awfully blunt with my criticisms in games but don't feel bad! It's something that is pretty much subjective. Others might see it differently. Though yeah, I think if you want to make it longer, it has to be reasonable in story wise to justify the slowness! I like slowness if the story is captivating enough and it does not have fillers.
I'm sorry that I made you laugh with that bathtub imagery but I swear I couldn't give up that idea when I thought of it so deeply by logic.
I hope next time your stories would be improving as it goes on! I enjoyed it quite much.