Game has a great theme, the music fits well with the game, calm and not so apparent (at least I think it was supposed to be like that), the arts are very good, getting a haunting and mysterious vibe, the mechanics with the level design it combines well.
It can definitely improve a lot, some things in the game design, for example gravity and movement, when I tried to dodge some enemies I ended up taking damage, because I didn't have time to escape.
Also the feedback, when I got the double jump, I almost didn't understand it because it didn't notify me that I had gotten it.
But anyway, a job very well done! Congratulations!