Desolator

Desolator is best described as Defender without the little men. What is still
there is the fast horizontally scrolling landscape, the green aliens (also
known as the Gargoans), the radar and, to a certain extent, the rescue
objectives. For lack of humans to rescue, you must instead capture the
“Energiser”; an object which certain enemies will try to steal.

The game has, just like other Defender-like games, several types of enemies,
from the rather dumb basic aliens, to stationary objects with high firepower,
and quick hunters which might crash into you. Each level has a specific
objective, though it is usually finished by killing everything that moves. As
a last-ditch effort, you can activate the “desolator”, which is a fancy name
for a smart bomb device, killing everything on-screen.

Desolator