This game is very cute. It nails the style it's going for. The sounds the kids make when they're running around or biking really fast are fantastic. The music and incredible art style bolster the style which permeates all facets of the game.
The story is fine, but way too slow. The game is much too long. It feels like a 3-4 hour cute little indie game but it lasts 8 hours.
The gameplay is fine, but not nearly good enough to justify how repetitive it is. The combat is fine, but not great. There are some interesting ideas incorporating co-op mechanics such as high-fiving to heal and the two character's abilities interacting. It kind of falls flat, though. We usually just separately beat the shit out of the enemies except when a boss required us to combine our powers. It Takes Two, one of my favorite games, does a much better job at co-op combat. The puzzles are fine, but nothing to write home about. They rarely made me feel smart, and a few times made me feel annoyed. At one point, we couldn't figure out what to do, and then I somehow walked through the fence we were trying to get through, as though there were a gap in the fence that we couldn't see, but then neither of us find the hole or figure out how it happened. I still don't know if it was a glitch or what. There's too much walking/biking around. I wish biking were more interesting.
All of the gameplay mechanics feel like they would do a good enough job at supporting a story driven game, and the story feels like it would be good enough for a gameplay driven game. This combination results in a game that is frequently slow and boring.