Hey thank you so much for that comment, it really means a lot to us! <3
You are totally correct, the 4th level is indeed the last one ;)
It can be a bit tricky, maybe even frustrating, but nothing forces you to scare them at the same time, you can pretend two of them don't exist, and focus on one, and them move the second one, and then the last one.
Yeah the sound are a bit drowned, I agree. I made them when the music was not integrated yet and had no time to fix the volumes later on, but oh well ¯\_(ツ)_/¯
One mechanic that isn't actually explained is that if you keep a ghost inside an object, it slowly depletes its energy, so you can find yourself short on energy if you do this.
Did you play on Firefox? For some obscure and unknown reason, the hitboxes on the side of the screen are off to the side if you play on Firefox, couldn't figure out why :(
Thank you again for the lovely and detailed feedback! :)