Nice work, the sprite design is good, there's a good balance of colors, the ghosts enemies stand out a lot because they're bright white, while the platforms are darker and blend into the scene, but are still visible enough to play. The level layouts are unique and encourage exploration. The main character has some nice details and I like the use of the black outline to create more contrast between the characters and background. The item number display is hard to see because its black text on a dark background, I would make that a brighter color so the player can see the item count.