Honestly, he told G4 so:
[quote]
"I have an interest in making first-person game." Ueda cited Valve's Half-Life series as FPS games he likes, stating, "Usually, you have to incorporate storytelling with constraints, but the way...[Valve] implemented constraints was something different that I enjoyed, compared to other games."

"[If] ...you're in the middle of play, in the middle of the game, then all of a sudden you're in a cut-scene [and] you're not supposed to operate at all - that's not the kind of game I want to do. If there is some other techniques that will not give them that kind of feeling, that's something I want to implement."</blockquote>

If anyone could make the most sterile genre fresh again, it would be Ueda. Still, we'd rather he stuck to games involving gigantic animals. They're just so cute.