A thought-provoking game with beautiful artwork and atmosphere!
I've played this game back in May 2017, but neglected to leave a review and I came back to get the Slave and Sinner medals that I had previously missed.
In terms of its platform gameplay its actually not particularly great; it is tends to be a little slow and mechanically shallow. There are also a handful of unpolished spots in the game where it is a bit hard to tell where you're supposed to go, and sometimes needed to take a few "leaps of faith", only to fall right into a spider or spike. The ability to look up/down can solve this issue. There are also one occasion where I had no choice but to run away from a Gun Executioner to get to a door, but wasn't fast enough and he still managed to fire a single bullet and kill me.
The "Sinner" medal is particularly notorious to get. It requires you to go out of the way to explore and get Gomadi's commands(occasionally having to initially follow a command until it gets to the point where he asks you to kill yourself), and it seems you need to get the blade (which won't affect Pacifist ending) to fight(no need to kill) in one of the commands in the 2nd half of the game. It is also pretty slow to play through to get all the endings and medals.
Fortunately, the gameplay itself wasn't the point - the story, message and thoughts it provoked based on the choices you as a player have made, along with its great aesthetics is what drives this game and what gave it such acclaim, and thus the flaws I mentioned above can largely be overlooked, helped by the relatively fast respawn times, unlimited lives and not being forcing to re-unlock doors on death. At worst, it just feels slow to get through the game.
All in all, this is a great entry and I hope to see more games like this.