Hey
http://github.com/ippa/ghost has a lot of basics committed, but started to slow down a bit ..
I would love if you guys would like to chip in and make this the team-effort ludum dare "requires" :p ..
Maybe some levelgfx .. or enemygfx.. or music .. or a logo.. or sound (like good wind, car noise for the intro or whatever) .. or even whole enemy classes, if you can base them on Chingus GameObject-class it would be wonderful:
http://github.com/ippa/chingu/blob/master/lib/chingu/game_object.rbBasically that's a class which responds to image, x, y, angle, center_x, center_y, factor_x, factor_y, color, mode, zorder .. and then calls image.draw_rot(). draw / update will be called on that class.
I think it can end up pretty well with its "odd" plot .. I'll explain the details on IRC if you wanna contrib :P