Shooting games here are about aim and timing more than reflexes alone. You line up a shot, read where the enemy will be, and fire before they do. Some rounds ask you to steer a vehicle and shoot at once, which splits your attention in a useful way.
Hills Of Steel rolls a tank over bumpy ground and asks you to keep the barrel pointed at the right angle while the hull climbs. Dogfight takes the fight to the air, where speed and a good turn matter more than a big gun. Obby: Battle Arena mixes platforming with combat, so a missed jump costs you the round. Purr Magic: Merge Balls is the quieter one: you combine balls to build stronger shots instead of aiming in real time.
Start with the tank if you like weight and angles, or the planes if you prefer speed.