Powermanga

Powermanga is a 2D shooting arcade game. It is licensed under GPLv3. The latest version of the game is 0.93 released on September 20th, 2014. While beginning as a C++ game, Powermanga now uses C99.

Gameplay
Powermanga plays much like a traditional space shooter - but has a wealth of features that are uncommon. The game has 41 levels and more than 200 sprites. You can collect powerups to increase your ships guns, shields, health and speed. There are many kinds of enemies - and several different strategies they will employ.