Glad you liked it! Yeah, I feel like metroidvania and horror actually works pretty well as a mashup. In fact, part of the reason I came up with the idea for this game is that Alien: Isolation, one of the inspirations for this game, had certain metroidvania aspects that I felt could be expanded further upon.
I did actually use Unity's 2D lights in this game, but I understand if you didn't notice since not a whole lot of things cast shadows in it. If you played on low quality, then shadows are completely disabled. I could probably have gone even further with the lighting.
Thanks for the encouragement and for playing my game :)