Pros
-Story is not presented through dialogue, but instead through collectibles/memories & character's expressions
-Beautiful OSTs
-Good atmosphere + theme
-'Chibi' style the game has for its characters
-The different general areas of the game are designed in a way where it never feels the same each time. Uhh good level design, not sure how else to put it
-The non-boss enemies have good designs. They somehow seem creepy + pitiful at the same time. The OSTs that play in the background really push that notion forward, I think.
-The mostly grey/desaturated color palette definitely works in the game's favor, not just in design but also mechanically with the red popping out more. I feel like this game wouldn't be as good if it was all colored normally.
-For time attack, you can go at each level one at a time, in whatever order you want.

Cons
-Boss fights do not have checkpoints.
-You might get more worth out of the game by waiting for a sale.
-The physics for this game can be a pain in certain levels.

Last thing to keep in mind would be that the story/game is genuinely dark. I don't really have anything else to say.