This game is absolutely adorable! Super cute art, easy to understand game mechanics! And fun! The music is also very nice and chill, but a little bit repetitive.
One suggestion would be to give visual feedback about the stronger ghosts getting hit.
Another thing was that I've got an azerty keyboard so the awd controls were kinda hard to use (finger gymnastics), but I don't think many people will have that problem!
Anyway, good job!! :D