Algodoo

Mouse controlled plane with 10 HP. Automatically drops a barrage
of bombs.

Win condition: enemy stops shooting
Lose condition: you stop shooting (at 0 HP)

Boss is made out of 19 target-able components:
12 wheels (25 HP)
2 flak cannons (50 HP)
2 homing missile launchers (50 HP)
3 high-explosive flak cannons (25 HP)

I highly recommend observing the behavior of the boss, most notably
the 4 flak cannons, before attempting to win (its possible BTW).
If having trouble, remember to aim ahead (since the boss is slowly moving
right) and going for the homing missile launchers first. Most Hp is lost early
on when destroying 1 missile launcher, and it gets much easier after that.

A sort of part 2 after my UFO boss-battle scene.