Great animation on the spider, and the idea of the game is spot on. My suggestion is to make the spider despawn after 30 seconds or so and respawn further away. I keep getting stuck in rooms because it won't leave. I'll hide, it will lose interest, and then it'll just hang out in front of the door forever. One of the times it did go away it kept glitching back and forth This seems to happen when I have everything I need.
Edit: Either that or give a weapon or deterrent to ward it off for a second.