$8.99 will be the set price for the game. It won't increase as we add more content.
There is no blood or gore in the game. The "little more" includes hypnosis, implied mpreg, but they are only brief moments so we didn't want to get people overly excited for them.
We don't have a roadmap, no. We're two hobbyist developers with day jobs and studies so we can't really commit to such a thing.
There isn't a brightness setting, no, sorry.