 If you liked
Blue Gender
|
 ...then you might like
Uchuu no Kishi Tekkaman Blade
|
In both series, the Earth has been laid to waste by horrific bug-like monster aliens that tend to kill lots of people and be very hard to kill. Only a few people (usually our mains) have any chance at all of beating them. One of the goals of both series is to take back the Earth from the invasion.