Your effort and execution with the atmosphere is well done. I liked how the music is chill and something soft enough to vibe to without high stress, but coupled with the ambience of rain and thunder it gave Halloween-y energy.
As for the gameplay, the slow but smooth speed of movement and momentum blended well with the chillness of the music. Although I struggled (as I myself am not very good with platformers), I enjoyed it nonetheless. Good job :)