Ori and the Blind Forest embodies the best of what platformers have learned in recent years. There was a connection between art, technology, great level design and nearly perfect entertainment in the game.

Ori is one of the most beautiful and most fun metroidvania platformers of our generation.
The visuals are breathtaking, the gameplay is spot on. While I've seen many claim it's too difficult did not find it particularly hard at all. Unless they're playing it with Keyboard/mouse instead of a controller. Which you shouldn't do.
Obviously some levels are harder than others, but it's challenging just enough to make it rewarding.
The story is heartwarming, and the animations and control are smooth a silk. It's about between 15-20 hours depending on your playstyle and if you care to collect everything the game has to offer.
The game always gives you new varied areas to explore and new abilities to master, and has paced those perfectly.
Just as you get familiar with an ability or region, you get introduced to a new set of exciting and fun ones.

I struggle to find anything bad to say about it. But then why would I? It's just great.

Very pretty game, nice soundtrack. Love the revival of the 2d platform.