I loved this movie overall, however it lacked in more than one area.
Firstly, I feel that Manu should have apologised to Maanvi, instead of just stating that he likes her and doesn't care if she was a boy before. It felt a little pushy, in the sense that he didn't verbally acknowledge the things he did and said wrong.
Secondly, the happy ending was really nice, but I'd have liked to have seen how Manu's family spoke to Maanvi after Manu publicallu showed his love for her. It just seems incomplete.
Lastly, I do believe that Maanvi should have been played by a transgender actor, but either way the movie showed the right message