Not very good at all lol.
I think the concept could have worked well, they just focused too much on shit that didn't matter. About half the film is development of the creature, which I think is fine, but after that it literally puts an emphasis on sex and sex change.
The first half seemed to drag on for a long time though, as neat as it was watching the thing grow up. It was basically a good concept with bad execution.
Also there's probably gonna be a sequel lol.