You did really well creating an atmosphere and telling your story through the environment. In the short 3 minutes it took me to walk through this, I felt fear, wonder, and awe.
The visual design of the spaceship is well done, but the motion blur was a bit much for me. My favorite part of the game was the inside of the black hole. The spiraling colors not only looked aesthetically cool, but changed my mood from "oh crap I didn't escape" to "ohhh, where is this taking me?" My favorite game of all time is Outer Wilds, a game that filled me with wonder, and I felt some of that wonder again during the short experience of Event Horizon.
The sounds are well done and fit the setting. If I nitpicked one thing, it would be that the door opening sound got a little too high pitched and loud towards the end of its duration.
Great job!