via Internet Archive (dubbed in English):
Moria gives it 3 out of 5 stars and says, "Mario Bava accumulates a wonderfully haunted atmosphere." 1000 Misspent Hours gives it 3 1/2 stars and says, " it is one of Mario Bava’s finest and most influential gothics, and is almost certainly the most visually stunning movie he ever made." DVD Talk opens with this:
Widely recognized as one of the finest Italian gothic horror films ever made, the late, great Mario Bava's Kill, Baby... Kill! is a testament to the director's skill at combining painterly and atmospheric visuals with unusual and otherworldly storytelling. A ghost story at it's core, on the surface the film might seem to be little more than a well made exercise in style over substance but a bit of digging and it's obvious that there's a lot more going on in the movie than simply a little blonde ghost making trouble for a small town.Slant Magazine gives it a good review. Rotten Tomatoes has a 61% critics rating and a 71% audience rating.