Great fun :) Fantastic art! I really enjoyed the whole visual atmosphere, and the little heart animations stand out as a very cool little piece of polish I didn't notice at first. And really enjoyed the story/character side, especially after reading the last bit of text.
I agree with a lot of other comments, the two-swing attack idea wasn't totally clear, but I did realise the low swing (or backswing as I interpreted it) had a hitbox - and yup it's faster so optimal strats for killing baddies are stabbing the little fellas' toes with the backwards jab.
Oh and for me the difficulty balance was just right to be casual but not easy. So I guess we've got a goldilocks situation.
Anyway, thanks for a fun little game! 'Twas very cool.