[throws my invaluable opinions down onto the table] ok let's get started
first off: i like the creativity for the weapon. like, holy shit, that's a literal fucking cheese grater. guess we're having string cheese for dinner amirite. jokes aside, i love the idea of using a common household item as a murder weapon, let alone one like a cheese grater. love that originality.
next: maybe specify where the "sickly sweet smell of rotting fruit" is coming from? that line kinda threw me for a loop, cuz i was just like "does the body smell like rotted fruit or something???? what????????" and you never want your reader to think that a dead body smells like rotted fruit. unless there's rotted fruit inside of them, then yeah i guess that's acceptable
lastly: maybe add more detail to the gore. specifically the bones and insides part. like, maybe one gut is hanging out more than the other. maybe one rib bone is smaller than the others. adding that kind of detail will make it more immersive and really pulls a reader in.
those are just a few things i noticed and either liked/disliked.
please do take my opinions with a grain of salt though, i may write a lot of horror stories but i'm not very good with giving advice.