is high amount of gore and blood considered nsfw for this jam? like does the creator need put nswf tag always visible and cover tell it nswf and everythin?

NSFW in this case specifically refers to porn - i.e. nudity and sex, so you're okay with that. I think a lot of people would appreciate a warning if your game contains a lot of blood and gore, though! Maybe keep it off your screenshots and add a warning in the game's short description? :)