I thought this was really cool!
I loved the way things kept shifting. For a while, I was really on my toes. It really felt like anything could happen for a moment. The only part I didn't like was the maze. I felt the spider stopped being threatening. Maybe adding some other threat to the maze would have made it more effective? That's just my opinion though, so take it with a grain of salt, obviously.
I do wish there was more to it, but it makes sense given that it's a game jam game.
If this is what you make for a game jam, I'd love to see what you could make given more time!