I love that in this one you play the supportive/tank person and have your AI bro do all the shooty shooty. That's a good contract to all the games with the AI/NPC being the supporter/helper and the player being the shooty boi/grill/div. The visuals and animations are nice and react well with the controls.
The buttons in the levels seem like they could have more of a puzzle to them, so it adds to the gameplay a little more. But that's me as a puzzle biased person saying that!
Cute game!