Definitely a decent game for it being your first solo project, I was truly spooked for what seemed like the entire gameplay, and at times, scared outta my chair! The atmosphere and pacing was good, you accomplished that. I'd suggest making the objectives a bit more complex, but with a clear understanding of what needs to be accomplished, and maybe have the enemy be a bit more present. I only suggest this if you were planning on expanding on this game.
Great work!