Really nice game, and a fun concept, I really like the art.
platforming is really smooth although the jump felt a bit floaty,
If you're too close to a wall you could do infinite jumps which means the use of the ghost is underutilized, but idk if that was intended.
If you draw the line too close to the bottom you lose.
all in all, I really like the mechanic and think it could be nice if expanded upon.
Good job!