Take a look at Roblox’s most popular games. You’ll find loads of games involving killing but not a game about committing suicide. Anyone would assume that self harm is less appropriate than harming others in Roblox.
I said “to a reasonable extent”. I did not specify the intensity of the gore as it was unnecessary; Roblox is a children’s game, of course severely gory games are not allowed. Roblox allows a reasonable amount of gore in your game such as corpses(not too graphic) and blood.
This is all self explanatory. If your game compared to other games has a lot more gore, then it’ll probably get moderated. Even without considering what I’ve said you should be able to use common sense to tell if a game is too gory.