thats what i thought too but im stuck after the fifth video
okay so my interpretation of the story so far is this:
guy gets haunted maybe either literally or mentally,and has trouble sleeping. maybe theres also some sort of cult involved because of the whole "we are happy people". maybe put the audio from the first three into a spectogram or something/similar or slow it down,but i have no idea where to go from there if theres nothing in the sound. maybe wait on updates since its listed as in development