Hi nice game you made there. I think the art is very beautiful.
Here are some tips how I think the game could be further improved:
Require the player to doublejump before he comes to the moving platforms. I was stuck at this part for quiet a while because i did not know about the doublejump and always died there. Maybe you could teach this in a save environment.
The first cutscene plays after you have killed 3 ghosts. I was standing on a moving platform when the cutscene startedbut the platform continued moving. Maybe fix that.
In the bossfight you could give the ghosts an appearing animation, so the player can get away when the ghost spawns right inside him.
After all a cool game. Looking forward to see more.