I don't want a pure ending. As I mentioned, I want to make some changes to the heroine. make her more liberated and have some fun, but don't turn her into a cumdump or a villain.
What Goblin meant that in version 1.0 there will be 2 endings: Good and Bad.
Good is where you, presumably, end up kicking Richard and Alicia's butts.
AFAIK it will be achieved by completing the Roya questline before you've made the ultimate mental change, and doing that last mental change is how you achieve the Bad ending, where Aura is fully corrupted.
So you can do as many mental changes as you want without it affecting the ending, as long as you don't do the last one.
Past 1.0 there may be more endings, it remains to be seen.
Just be aware that the mental changes are somewhat linear and dependent on each other, so you can't just pick and choose the mental changes you want.