Always Rember:
"Genocide is just another game. It doesn't matter if it's humans or Makai residents Japanese goblins."
Game looks absolutely amazing. The quality of the pixel art cannot be overstated! I also really respect the HUD design, namely how Yuuka's health bar wraps around her portrait!
I don't have much to say that hasn't already been said in regards to the gameplay being the area with the most room for improvement, but I guess if I could make one suggestion: instead of having two different buttons for switching sizes, perhaps just make it one button that toggles between the two?
Regardless, great work!