#6: Hint 1: At one point in the game the whole scope of the story suddenly explodes in size.
#6: Hint 2: A summit of extreme hight is where you realize that the adventure has only truely begun now.
#6: Hint 3: In how many games do you accidentally destroy the entire world?
#6: Hint 4: The two most important characters have brightly colored hair, red and blue.
#6: Hint 5, final hint: You meet alot of creatures believed to be long extinct.
It's Ys VIII: Lacrimosa of Dana, I'm surprised that no one got it after the hair color hint.
#4: Hint 1: Aliens that attack our world come from another dimension that reminds me a bit of the mirror dimension in Doctor Strange.
#4: Hint 2: The first part of the name of the place the aliens come from is also the first part of the name of the game.
#4: Hint 3: At the end you get the choice to kill your sibling.
Didn't think it would be that hard.
#4: Hint 4: The actual villains are two people who went different extreme routes to find ways to beat the invading aliens and both end up as huge abominations.