"There isn't really an age limit in the demo, but maybe 11+?"
Just wanted to tell you that itch.io is for people 13+ that's the rule
Also just wanted to say if it becomes more disturbing and more mature then you should stick to age restriction the whole game will have because it doesn't make sense to advertise for younger audiences if they are actually not allowed to play the game. It can lead to much more younger people playing the whole game which wasn't intended to.
What other devs do when their demo is less mature is just pointing that out but still sticking to the age restriction.
A book for example rated for 16+ won't be less 16+ if not all chapters are as mature it's just the overall story and the fact that if there are mature themes younger people should not read it.
No hate just wanted to tell you that