I really liked it. In fact, it's probably the most mature plot I've seen for a videogame in recent years. But then again you don't get the best plots playing console horror games (with some exceptions)...
I'm all for sentimentality AND classic RPGs. However, I'm hoping the game knows some different notes besides sentiment. A sentimental vignette that long needs to have literally HOURS of character and story development to get the audience invested or instead of touching people, the game will bore them.
I'd be more impressed with a trailer that shows off an innovative battle system that harkens back to classic RPGs while bringing something new and fresh to the table.
It seems like a plot of a very good movie, and the goal of every time traveler. A twist was given on the formula, for sure. What it doesn't seem to be, as others pointed out, is a game. Instead, it appears an extremely pretentious attempt to inject adventure games with a mature, if common, theme into possibly unnecessary 16-bit, RPG graphics.
This could either be brilliant or a legendary miss, I have trouble imagining anything in between.