I also think this game is sooooo cute! I agree that the ending is a little tight collisions wise, and could be spread out a little more. You could also use separate layers to split up what collides with what; so then you could make an invisible "track" for the ghost to follow along so they don't fade through the floor. There are also some tutorials online if you wanted to have platforms that the player can jump up onto from below like in Mario, which could make the vertical climbing a bit easier. Great job though! The player's movements feel great.