Puck2099 comes up with an improved version of his Fenix port for the GP2x. Changes:

Fixed bug using diagonals, now it is used Rlyeh’s minilib to emulate the control.

Swapped L and R buttons to complain with GP32 layout.

Reduced delays in sound effects.

Added several optimizations using floats so it is a bit faster in some cases.

http://www.gp32x.com/board/index.php?showtopic=24607