I'll admit on first glance seeing the screenshots I thought "is this some sort of hipster thing?". But after playing the game (got it on a steam discount, and getting it again for free on PS+ soon) it made sense, I don't think he could have picked a better art style.
The simplicity fits perfectly, the levels aren't hard, nothings going "oh look at me", everything is just like "yeah, if you want to get into it your going to have fun. if you don't 'get' it, your not."
If it wasn't for the story the game would be a bit dreary. But its not like this should be sold as an audio-book, the way the narrative interacts with whatever your doing (yes, in a linear form just using trigger points... but still) makes it so much more enjoyable.
Are you going to hail this as your most played game? probably not.
Are you going to have a fun lazy afternoon playing this game? yeah.
Is it worth it, since its more about the story. Couldn't I just watch a movie? Sure, but good luck finding a movie where everyone is a block, doesn't talk and they keep jumping on the other actors. It's cheap enough, take a chance... If your on PS+ you get it for free anyway.