Well, it's buggy, the dialogue is less than fantastic, and the logic is lacking. (...Why does some random guy run up and give you HM03, with absolutely no explanation whatsoever and not even Ash going, "Wait, what just happened here?" when you could just as easily get Surf from Pikachu when it hands you your three Pokémon and Pokédex?) Still... it has potential, and I'm sure it will improve with time and the less logical aspects will get rescripted. This is an alpha, after all...
Anyway, I wanted to say that if you need a Mewtwo OW, I've made one for my hack and would be glad to share, since the OW in the FireRed base hack can only face forward. In my hack I replaced the Seel OW with my Mewtwo one, so it can look in all directions but doesn't have any walking animations. But I figured that makes sense for Mewtwo, since it just floats everywhere anyway.
I'm going to be doing Mew the same way, so let me know if you'd like either Mew or Mewtwo OWs from the side and back.