Straight to the point: Shield Runner is 3 lives, bosses with 55 base HP every third wave, playable in your browser right now. It is tuned for quick runs, honest difficulty, and controls that make sense the first time you touch them.
Drag anywhere to fly - the ship floats above your finger so you can actually see - and the guns fire on their own. Your job is positioning: thread the bullet patterns, collect the shield and homing-missile drops, and survive waves that keep escalating. Here you get 3 lives, bosses with 55 base HP every third wave.
The loop is deliberately compact: one round takes minutes, improvement is visible, and the next run is one tap away. That makes it a reliable filler for short breaks - and an easy game to recommend to someone who 'does not really play games'.