Howdy~
I thought that the mechanics you introduced were really neat and I enjoyed exploring them and running into them.
I have a couple suggestions that I think would be easy to implement and make a big difference. The first is introducing some sort of lerp to the player's jump, having the camera directly connected to the player's location was jarring. With a slow transition it would have looked a lot smoother. Second, I think that the objects that hurt you could do with some visual clarity as they kinda blended in with the scenery. If it had a visual highlight or maybe just a brighter color it would have made it a lot more clear.
I had a lot of fun playing this game and think you did a great job with the implementation. Everything worked well and I love that you included a neat and fleshed out story along with the runner. Well done!