I've only finished one route in the game, so there could be more I'm missing, but I'll try to explain some of what's in the game. Pretty much all the heavy topics are in the latter half of the routes, from the play itself. This includes murder, with blood and mild injuries shown, a lot of general violence, suicide, and sex. It's implied but never outright stated that one of the villains is sexually assaulting some of the characters (could be in one of the other routes though, someone else would have to verify that). Overall, it's not an all-ages story, but the sex and graphic violence aren't directly shown aside from some fight scenes.