Wow the game is quite incredible, you can make it even better by making certain changes, instead of using space to leave your soul you could have made it so when you hold click you are leaving your soul and moving around with it, so you could have used the space for jumping instead of "W". It would be nice if you have added small animations like the first enemy you could have added a small waving animation kinda like a ghost that has a piece of cloth and the player could have a small walking animation. You could have made the foreground and background more detailed and I mean that could have added different shapes and it would made it more aesthetically pleasing and make the player look sharper he looks kinda pixelated (maybe you could have made the sprite 256 pixels? and set it to 256 pixels per unit? so you make sure that looks sharp). The text should follow the player so the player doesn't miss anything. The music is pretty good, it has a small looping issue when it ends it doesn't sound properly when it loops.
But other than that, the game is really well made, thumbs up!