is min-max important? i remember i played this game a bit a while ago and then when i replayed it and looking at the walkthrought i realized i could get more points by taking diferent choices so my question is, can i get locked out of important content if i play in a not optimal way?
There are two main routes and each one has heaps of minor variations.
1)
Pure hero (doesn't kill if don't have to and don't eat monsters and enemies)
2)
Corrupted hero (kills everything he can and eats everything he can)
Of course, these are not the only routes, as they have a lot of variations and sometimes they can be partially combined, but these are two main routes.
Corrupted hero has several advantages. For starters, his stats are slightly higher because consuming some monsters gives extra power. He also understands the language of monsters because he is largely like them. So far it has no disadvantages, although the fact that you can kill and eat characters that might appear later in the story can be considered a disadvantage (less story).
Pure hero has no obvious advantages, other than the fact that most of the characters are still alive. There are theories that how corrupt we are will have a big effect on what ending we get. It can also have an effect on some end game fights, as a
corrupted hero has less control over his abilities (I don't mean that they are weaker, on the contrary, they are so strong that it will be easier for him to lose control) and is more susceptible to things that affect monsters.
So yes, some decisions require pretty high stats, which can be pretty hard to have, depending on the style of play you play. Corruption is a particularly problematic stat because the bar increases gradually and if you haven't increased it from the start you will very quickly reach a point where you won't be able to choose most of these options (high corruption sometimes offers an alternative solution that [surprisingly] may not be bad) because there simply aren't enough options for you to accumulate more.
Does that answer your question?