Wow. This is really, really impressive. I can't believe this is your first game! You must be a very talented artist, writer, and programmer. Despite the relatively short length of the game, there are already many breadcrumbs that speak to a bigger story.
--spoiler--
I can't wait to learn more about Eito's family (which is clearly a lot more complicated than an ordinary one) and Sen's ability (the marks on his neck ... Oof. Must be painful). And the main title screen ... One pair of hands clearly belongs to Sen, but what about the other pair? So many questions! I really look forward to what craziness you are stewing, and thank you so much for pulling through and publishing the demo for the jam. I had a great time!
(Also, just a random side note that hopefully isn't too out-of-place: The name of your game kind of reminds me of Higurashi: When They Cry. The superstitious small town + creepy incidents setting also help bring back my PTSD lol. You are at least just as talented in creating tension for horror scenes - I actually died two times during the clicking minigames lol. I'm sorry Eito baby. The designs of the piano spirit and the creepy man are also very cool! Again, well done!!)