I love it!
The animation and gameplay are awesome, same with the sounds.
But I think I'm not very good playing it, because I can't collect hearts many, but also I'm always dying. How would I have to play it?
Thank you very much! Lots of people have said that the game is too hard (including me). I found that the best way to survive as long as possible is it constantly attack, and not run away because lots of enemies spawn very quickly.