Ok, so right off the bat, I notice the art, and it's good. The text box fits well with the theme of the story and the background art. The idea of making the cursor a vial of blood also fits, especially because of the minimalist design of the text box. The sprites look very nice. I liked how the CGs were at multiple angles. It gives a more dynamic feel to the game. Overall, the art was better than the art from a lot of commercial otome games.
The music was also pretty good! It fit well with what was happening, and it wasn't boring. Kudos to your composer.
The story is very cute! I almost started squealing multiple times (especially the part when she met the hunter, 'cause hot damn). I like the plot idea. It makes me wonder what will happen if she falls for one o the other guys...hm... But I like how the story was also a bit serious. (like, what happens when they find out that she's a vampire!?)
Just a bit of constructive criticism, but I noticed a few errors in the script. Some spaces were missing in between the period of the last sentence and the beginning of the first sentence, and some words weren't capitalized when they were supposed to, but other than that, this game is perfect. Just don't forget to proofread it before you release the full game, I guess.
Btw, speaking of releasing the full game, do you have a set date for that? Also, are you planning to make this a commercial game?