Very good. Had lots of fun playing it and would definitely play more levels!
Game mechanics were strong. Switching between forms, really added to the game and made it feel good when we switched at the right time to pull off a section, especially when on the verge of the sun catching you.
Great that you did you're own artwork. It all looks good and the effects for sun and volcano looks really beautiful. Maybe could work on the animation for the characters, but it worked and I know the feeling, took me ages to get a walk animation half decent and you've got a walk, wolf run and bat fly, so not a criticism, just something that would polish the game.
I think the story was surprisingly good. Not something I'd have expected coming into this game. The concept is awesome and I like that you setup the crack in the window for the ending.
Overall strong game and I don't know if you're continuing this game, but I think it would be really cool with more levels and explore the lore of why humans and vampires are part of this game as it's a cool concept! :)