Minor spoilers to follow
I think the concept is really interesting (destroy the Beastmen! attack them! feast upon their flesh!), but the execution is way too rough and rushed to really be enjoyable. Other than the interesting concept (which isn't really developed, because it's like the last two lines) nothing leaves much of an impression. The writing is rough and doesn't really gives itself time to establish an atmosphere, and the imagery is bizarre not always in a good way: the shift from demonic imagery to colorful background with humans in it is jarring and the sprites are very weirdly positioned.
I will say that one aspect I did enjoy was the audio design. The flute music, repeated in two different versions, were very effective and there is some nice sound effects to punctuate the nightmarish scenes.