Seamless Co-Op Review
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I am playing the whole game in Seamless Co-Op mod with one friend[1] and this is a review mainly for that.

Where the Co-Op Shines?
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The one thing in single player gameplay is constantly dying during exploration on funny ways(As Miyazaki wanted) but that also means that sometimes you have to repeat a lot of steps again and again to get back to the same point as before. With this however, when one dies, the other guy can keep the minor enemies from respawning as long as he is alive except for Bosses of course. (This comes with a huge disadvantage that if you die you get debuffs and they keep stacking together so the game doesn't become easy with this strategy).

The other thing is Bosses can be easily distracted if they are being attacked from two direction but let make it absolutely clear this doesn't make the bosses easy. For every new partner that joins the game, the bosses health go up by 100% and also increases their various different attributes(Which can be increased further and which we did). On top of that the main bosses we have encountered in our first 30 hours of gameplay, all do such sweeps or AOE attacks that they hit both of you if you are close or sometimes even far away.
So even though the bosses are easy to approach with, they are tougher and will still challenge you a lot.

Sharing the experience with someone else is also a big thing. We went into this game blind and we didn't use online help if we got stuck. We simply moved to other areas if we died enough times and if it felt like we were not doing enough damage with our weapons.

Where the game shines?
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Choice of Combat: We played the first 30 hours just exploring and didn't even bother with combat that much. I wanted to be a ranged class that doesn't get into battle that much and my friend wanted to be a get up and close with a huge weapon guy. We both got our wishes from almost the beginning of the game.
And during this, we decided to change things up where we only used magic and didn't get into battle, where I took weapons and shield only to parry and we could do that without a hitch, where I just wanted to shoot arrows from far away, where I wanted to use swords smeared with my own blood for a lot of damage, etc...
No matter what type of game-play or weapon we thought of, we could do it.
That's one of the biggest areas where the game shines.

Free Adventure and Exploration: After first few hours we decided to start exploring everything and we were able fulfil that curiosity by going into a lot of areas, some areas not even meant for beginner levels but there was no one to stop us. We kept running, avoiding combat and picking up late game stuff at the very beginning only because the game wanted us to explore.

Frequently Asked Question
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Crashes/Bugs?
There are some crashes here and there but only when you don't do major actions together like resting together. However, there are some random crashes too but not so much that it will ruin the experience and since there are save points everywhere it doesn't really matter.
There are few minor bugs when an eenmy will have half a health when you wake up but it's rare.
You get debuffs if you die in normal exploration which stops the strategy of keeping minor enemies from spawning while the other player joins in.

1) Complete Gameplay was done live but not in English Language and can be found here: https://www.youtube.com/playlist?list=PLveYue9cL8c_CmhRapwTnwZplEqKG0JfA