Well, what can I say after trying this preview version of the game...
1) Events of this story occur after the Lost Christmas incident
2) The music was the same as in the TV series and I hope that they'll add some new songs specifically for the game
3) The main character is badass and kills soldiers without hesitation using these crystals
4) The Present can use them too (I suppose) and is resistant to his powers
5) Carol is hot and appears near the end just to jump on the protagonist
The production values are also quite high, and there was a lot of animation in it.
It's a pity that it's likely that nobody going to translate this game...