Fully played in co-op, which was also the reason why I even finished it. The game just didn't feel nice to play and that's mostly because of how the controls felt.

My thoughts:
(+ = (mostly) positive; - = (mostly) negative)
- Gameplay;
The controls were slow in all ways possible. Hitting an enemy never felt like it landed and the depth perception was off. All levels were unique enough, but mostly not really fun to play because of the reasons mentioned earlier. It's so important to have controls that feel nice to use. It can decide the whole experience for me.

+- Music;
It's alright I guess.

+- Graphics;
Charming but not as creative as it could have been. Paper Mario or yoshi woolly world for example use the environment in an unique way.

-- Story/Characters;
Zzzzzz....

Recommend?
No, plenty of other games that do the job way better. Super Mario 3D World for example.

Frustration, this game gave me a lot of frustration. Yet I kept playing it, because the controls felt so nice.

My thoughts:
(+ = (mostly) positive; - = (mostly) negative)
+- Gameplay;
I'm very mixed about how I experienced this game. The controls are super tight and when you get good at it you can fly though the levels. But at the same time there are parts that are so hard it feels unfair. The dark souls games never made me this salty...
The metroidvania part of this game is pretty bad. The hints are too vague to solve without using hints or a guide. Also the fast travel options are too much spread out, meaning when you're going the wrong way you've lost a lot of time while at the same time gaining a headache.

+ Music;
Nice catchy tracks that switch between 8bit and 16bit.

+ Graphics;
Same as the music, nice unique areas that switch between 8bit and 16bit.

+ Story/Characters;
Simple and funny, perfect for a game like this.

Recommend?
Idk, I'd say no but I've played worse games I'd recommend which deserve it less.