I would like to point out that everything but "but that's fine" is in past tense, which really bothers me, especially because it's repeated. You should change it to "but it was fine" or something.
Otherwise, I have to say that it's a little too short for it to make sense. It's obviously about some awkward monster, but why is it so awkward? Why does it have some complex thoughts mixed with really basic thoughts. For example, it knows about the concept of practice but murders a child and doesn't realize it. This story just raises some questions, and the blunt tone makes it significantly less creepy, in my opinion.
Well yea, that makes sense given that it's short flash fiction.
I would go with "but that was fine"
The story reminded me of Frankenstein's monster.