Opentyrian! Upgrade my ship!

"OpenTyrian
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OpenTyrian is an open-source port of the DOS game Tyrian.

Tyrian is an arcade-style vertical scrolling shooter.  The story is set
in 20,031 where you play as Trent Hawkins, a skilled fighter-pilot employed
to fight MicroSol and save the galaxy.

Tyrian features a story mode, one- and two-player arcade modes, and networked
multiplayer."