Xtron

## Description

_Xtron_ is a Space Invaders game, and mixed are some elements from Galaxian.

The player’s ship is bound to the lower border and is able to move left and
right. At the beginning of each level, all alien ships are approaching the
screen in different formations, already firing at the player before they
settle to their position on the top of the screen and start single attacks to
below.

After every two stages new alien types are appearing. There are no extra
weapons and the player ship is limited to very few projectiles at the same
time. The background is a scrolling starfield, the user interface is only an
optical gimmick beside display of points and players lives.

Xtron