First off, congrats on getting inspired to write fic again! That story is now my personal canon, and I definitely don't think it would hurt to post it (I'm sure there's at least one Toy Story comm set up, and you could always cross-post to moviefanfiction if you're looking for reviews.)

If you do end up posting it, I'd suggest not divulging that you wrote the story right after seeing the movie. Sorry if that comes off as elitist or whatever, but I have a feeling it will turn most potential readers off if you announce that.