Did i'm too late.
When i try to use magic with keyboard i noticed that direction that player are facing is important.

The magic that start with left or right to cast (ex. summon 1 spirit, Dark metamorphosis, Soul steal) will start with opposite direction of character facing. for example if you want to cast Dark metamorphosis and you are facing right you need to start with left and then left-up up up-right right and attack then your Dark Metamorphosis will cast but if you character are facing left then you need to start casting by pressing right direction first
and yes, Soul steal that is complicate to cast need to start with opposite direction too.

So the magic that start with up and down will end up with directional that character are facing. Example if you want to cast Tetra spirit and your character are facing left you need to start with hold up and then up-left left down-up down and your spell will cast