I got up until the Bianca boss fight. It might just be because I'm shit but it was too hard to get past.
The gameplay is honestly really boring.
The music is nice, the animations look smooth. I haven't encountered any bugs and I liked seeing the short clips between levels following the 'story'. So those are the good factors
I also think the art itself looks very amateurish. It looks like a simple flash game and well... that's what it is but I see that you want to turn it into a full fledged game, in which case the art really doesn't help its case. That's just my 2 cents though.
I'd say the biggest obstacle is the gameplay, it feels like its by far the most major flaw that makes the game not interesting.