Visuals are amazing. The sprite work and animations are all really well done. The effects and sounds used when hitting an enemy were very satisfying.
I found the layout of the world to be quite confusing though. The arrows at times seemed to just lead me in circles. The screen size also felt a little too small, being able to see more on screen probably would've made navigation a bit easier.
Kogasa and Nue's abilities were implemented fairly well, though I can imagine more would've been done with them if there was more time, what's there still works.
Overall, very good game with excellent visuals.