Linking bullet hell styling and horror is a fun idea, and some of the art here is decently nice. I think the shots fired by the player need a bit more feedback, even just something flying out when you shoot; it was hard to tell if I was even doing anything to the enemies for a bit.
Also, slight issue audio wise: When the stacked enemy appears in the second... level? After the cutscene with the flowers, hitting any of them stacks the sound on top of each other, which... is really unpleasant, if I'm being honest. Being a bit gentle with that since, yknow, one week and all, but just something to look out for moving forward.
Music would be amazing, but considering the limited time frame, and that good musicians are hard to find (and hard to budget for...), it's understandable.
With allll of that said, the gameplay loop itself was fun! Controlling the character felt good, and the bullet patterns were interesting enough where I was kept on my toes a little bit. This is something I'd *love* to see expanded on in some form. Good job, overall!