Zzapped in the Butt

Zzapped in the Butt:

An alien mothership lurks above the Earth's surface. A forcefield has been blasted out to keep the little blighter away from Earth. Unfortunately however, the alien is desperate to invade your city. It launches the alien forces down to take over your cities and destroy them. Your job is to defend your city from alien attack by zapping them. Watch out though. The alien mothership will also be firing its lazer at times, trying to destroy your space ship. Can you defend all of the cities from wave after wave of aliens, and avoid being ZZapped in the Butt?!?! Good luck pilot.

This game is a 4K entry and has been released for the Craptastic 2020 mini game competition, run by Reset magazine.