I only played for an hour this evening after the digital download unlocked. Impressions so far:
The start is everything I expected. The title feels like Ico and Shadow of the Colossus in a good way. The same aesthetic and early sense of exploring your capabilities and environment brought back memories. While not as clean as something like Ratchet and Clank, the visuals on the PS4 Pro with a 4K display are crisp and well defined. There's some aliasing along edges and shimmering textures but it's better than FF XV in that respect. HDR really suits the visual style of the title and is used to good effect even early on.
The controls suit the game. No, you don't have pinpoint precision in your controls, and it can feel like the camera is fighting you. Neither of these should be surprising to anyone familiar with Ueda's prior work. The camera wants to show you something of interest. It has an artistic goal as well as providing hints, so it's trying to serve these needs. The controls suit the stumbling struggle of the character and I haven't found them particularly objectionable because I don't expect it to be a precision platformer or a competitive shooter.
It's a love letter expressed in animation. More than anything else, the game conveys what it has to say through lovingly crafted animation. If you aren't soaking in the body language of Trico and trying to get a sense for what he wants and what he is thinking then you're missing the entire point of the game. I've been blown away by how expressive he is even in the early going.
I plan to take my time with the game because I know it's going to be altogether too short. I hope there's enough variety in puzzles and environments to keep it from feeling repetitive, but so far I'm delighted that the title finally made it out into the world.