These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Perhaps, its obviously mutton (or leg of lamb). Since it's a British made game, one should suspect some cultural references in game. But again, why is there meat and how?
Nightmare Fuel: On the game's official website, Naughty Bear would come out in a cheap Jump Scare. Not really scary in itself, until you'd reach the main page where Naughty would stand there, watching you. He wouldn't do anything, but his Kubrick Stare was quite unnerving.
In-verse, some of Naughty's nastier kills and tactics can be this due to their brutality (driving bears to commit suicide and slamming their heads into electric equipment come to mind). Some of the enemies as well, such as the vampiric and zombie bears.
Just the whole concept of Naughty Bear. Although, it's Played for Laughs the whole game encourages you the player in divulging in the acts of violence and dismemberment (or "deflufication" in-universe) against the many inhabitants of Paradise Island. Even though they're mostly made up of Asshole Victims some of their demises are pretty unpleasant. But the biggest thing though is how the player is made to be a Super-Persistent Predator and a one man killing machine.
Some of the short collection of videos promoting the game at it's time can come off a bit like this too. Here'sallfourof them.
Too Dumb to Live: "Oh no! Naughty's gone berserk and is murdering everyone on the island! Let me fix this broken telephone right out here in the open!"
In the ending, the other bears invite Naughty to a celebration. As soon as he gets there, they smash a cake into his face and laugh at him, without trying to kill him or anything. No surprises as to what happens next.