Honestly I really enjoyed the game, short and sweet.
This is very evidently a game made with profound artistic intent, and as such it "plays" like a poem, or a work of art, rather than a game, and I will treat is as such.
I have only played :ephemera out of your portfolio, but when comparing the two, the resemblance is only in the stylistic execution, rather than the content. :ephemera felt much more like a surreal poem, conveying meaning through the medium of the game mechanics, something complete on its own - it left nothing to be said. Instead, this game leans more on the worldbuilding, and conveys its emotions through environmental storytelling. It feels more figurative, refined, less "raw" and abstract than :ephemera - it leaves less to the raw emotions and more for the brain to piece together pieces of what feels to be a larger puzzle.
On the more technical side, I understand the struggle of not including a main menu, and thus not including an option menu - it goes against the point of the experience. However, as some have pointed out, the camera sensitivity is very high, and when combined with the (very well executed) wobble and impreciseness of the turning it may lead to some motion sickness after some time.
Great use of the short runtime. It absolutely leaves a very strong impact. Bravo, very well executed.