(Played on Mac OSX version)
It's working great with a fast pace, not that easy but definitely balance not to be too hard or frustrating.
Maybe a little vibe of Xenon II in the palette colors and univers, really nice Music too.
Can play with Joystick or keyboard (Fortunately, several keys to shoot, because on Mac, Arrows + Ctrl are assigned by the OS).
in the end, very good job, guys !