Install xgalaga++ by entering the following commands in the terminal:
sudo apt update sudo apt install xgalaga++
Description:
classic single screen vertical shooter, inspired by xgalaga
XGalaga++ is a classic vertical scrolling shoot'em up. It requires no X Window extension and its window is freely resizable. It is inspired by XGalaga, but rewritten from scratch, except for the graphics.
Homepage: http://marc.mongenet.ch/OSS/XGalaga/
Version: 0.9-2
Section: universe/games