Killer7 is far more avant garde than it is about being an approachable game. In such a way, a lot of things can be praised about Killer7. The protag super powers and way they interact with the world, the way people talk, how death and cutscenes are shown; Killer 7 is a very stylish game, no question. Once you start to remove all the fluff though, you get a game with a ton of cryptic hints, frustrating movement patterns, and a story that doesn't make sense.
I'm not inherently mad at Killer7 for how it presents itself either, but it was completely jarring coming in expecting something akin to No More Heroes only to get Star Fox with puzzles that make some other games blush. Killer7 is a hard sale and I wish it wasn't. It really has a lot of neat ideas and sets up a world that is super interesting to dive into that they even made a book. While I'm not nearly impressed with this game as most, I do wish we get more of this series as it was at least an interesting start.