Ok, here we go.
1st, THE BAD THINGS: Well, the acting etc. what has been critiziced wasn't very good, it could have been better. The next time you should tell your friends to relax in front of the cam, to move like they do when the cams are off. Yes, the film seems rushed, but OK, it's just a fan film. Something you want just to have fun with. When I watch a fan film I don't see it as a film, I just see, you know, people having fun in the right way, instead of smoking weed, they do something creative.
it's not like its a "big,huge dramatic epic REAL batman movie,it's a fan film with very good story told to hell with somewhat bad acting it's a great story!.and technically speaking the guys 19 i believe (profile) so,technically he is a adult.it is very faithful to it's source material and with better budget and acatorsd (due to the returning cast.....and keep the joker guy) he could replace Nolan!
Anyway, for the next film do something different. Try to write an original screenplay, don't write something based on something that just exists. You know, a Batman movie isn't the best a 14-year-old guy with a non existing budget can realise. So, for your next movie you should write YOUR story, and it should be about teenagers. You know, the worst thing a teenager could do, is a film about adults.
Keep' doing your thing but I would enjoy to see something more "based on you" the next time.