Wrath of Tycho 2.0
Tycho didn't die when his ship crashed... and now he's back, and he's pissed. He wants you dead. The levels here are not easy, but they tend to be tough not because of good planning, but because of overwhelming numbers of baddies, and lack of ammo. 6 or 7 blue hunters at a time, e.g. Update adds much better term text, a new level, and some tweaks.
Levels in map "Wrath of Tycho 2.0":
Blow Up the Outside World
Split-Atom Blues
Lonely, Are The Brave
Napalmolive