Tyrian

Tyrian is a scrolling shooter computer game developed by World Tree Games Productions and published in 1995 by Epic MegaGames.
The game was officially released as freeware in 2004, and the graphics were made available under an open license in April 2007.
Tyrian was programmed by Jason Emery, illustrated by Daniel Cook, and its music composed by Alexander Brandon and Andras Molnar.