Hi there, fellow game creator here!
Great progress so far, it seems like you have a nice idea on the theme and feel of the game! Definitely looking towards the progress you make.
One suggestion that I would consider is to add more signposting, on levels 1 and 3 it isn't clear that the cogs and steam can kill the player/ghost. That and a little explanation on how things work and it will be even greater.
Looking forward to your progress.
Steven