Calm Orbit is a browser game built for short, satisfying sessions - it loads instantly, plays with one thumb, and runs on any mid-range phone. The setup is simple: 4 lives, bosses with 50 base HP every third wave. Nothing to install, no account, no waiting.
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 4 lives, bosses with 50 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'.
Endless waves, 4 lives, a boss every third wave.
There are 1 close relatives of Calm Orbit in the catalogue, which is unusual here. Comparing it with Star Defender takes about a minute and tells you more than any description.
Difficulty sits at Easy and the player count at 1. Those two numbers decide more about whether you will enjoy it than the theme does.
If you are choosing between this and something similar, start here when you have Easy energy and elsewhere when you do not. Calm Orbit does not pretend to be more than it is.