The music is great and really helps with the atmosphere :D I also love the visuals! I also like how the spikes are very forgiving (most of the time). I like how they don't send you all the way back to a checkpoint, but only knock you back. The controls also feel very good, and correct me if i'm wrong, but I believe you've added coyote time, which is amazing, but you haven't added jump buffering. I'm not really sure, because I always find it hard to test these things. This, (definitely if you aren't paying attention to it), does not affect the gameplay at all, it's just a tiny thing I like to add to make the gameplay a tad smoother :)