Wowie, what a great piece of work. First thing I noticed IMMEDIATELY was the visuals, clean animation, good visual communication. I was never really left confused at what I was looking at and what I was looking for. The gameplay is def a fun concept and got the Alan Wake inspiration right away (this was before I read the GDD mind you). There was a genuinely spooky atmosphere achived here, probably my biggest complaint however is that the shadow beings never felt quite like a threat. Maybe adding a variety of movement speeds (including a faster one) might create a little more unease and sense of danger. I quite enjoyed the one puzzle, was easy enough for me not to be stuck but hard enough where I felt really smart when I got it.
*SPOILERS* I was actually shocked when I saw the "Ending II" at the end of my first play-through. Although I thought "Ending I" was maybe a tad simple to figure out. I love the idea and the execution of not really letting the player know or communicating in any way that there were different endings, created for a fun shocking twist.
Overall, fantastic work and cannot wait to see more from Y'all!