Definitely not God Of War... we all know why
Viewing post in Maybe the first game that asterios can try out ?
we kill humans all the time in videogames, i doubt that'd be a problem. i just don't know how sensitive he would be to combat overall. how gory is too gory? castlevania at least has a parallel in that the dracula's castle is kinda like the hotel, being able to appear anywhere and reshape the internal layout, along with having been around across many generations.
oh wow, the valley even spawns monsters to specifically torture asterion. conceptually this could go really wrong, in hitting too close to home, or really great, as in him taking it as having a chance to fight back his traumas in a safe space.
In the first God Of War there is a boss that is a Minotaur protecting the entrance to the underworld if I remember correctly, which will surely remind him of his own experience (not to mention the different enemy minotaurs that you kill throughout the Greek saga).
There is also the fact that you dedicate yourself to killing gods, among which are Hades and Hermes, which, knowing how devout Asterion is, would certainly not make him happy and would even horrify him. Not only because of the excessive violence, but because of everything you do throughout the trilogy.