When Tokuro Fujiwara and Yoshiki Okamoto started to develop the two first Capcom games, they divided their work like this: Fujiwara would make a shooting game (Vulgus), meanwhile Okamoto, the shmup specialist, would make a more traditional action game (Son Son). Turned out Okamoto couldn't help himself and Son Son is actually a very weird shooting game.

The game is obviously based on Journey to the West, with Son Son being Sun Wukong. It's a horizontal autoscroller where you use your magical staff to shoot the enemies appearing on screen. The screen is divided between six platforms, and you can jump up and down to change lane. Simple stuff, but quite fun!
My favorite thing about Son Son is how it incites the player to go for score. You can get points by killing enemies, of course, or by gathering various food items. There're also hidden bamboo shoots worth quite a number of points, and the POW bonus turning every bad guy on screen into food. It forces you to be more active in the way you play, deliberately going for some group of enemies or changing lanes to get items.

As all Okamoto arcade games, Son Son is viciously hard. Your attack has a puny range (another Okamoto staple), and the screen is quickly flooded with enemies past the easy first stages.
It's a fun arcade game on its own, and Capcom clearly has a fondness for it unlike with the forgotten Vulgus. Worth a look for fans of the company.