Planetary motion

pygame 844 2d 783 arcade 744 game 397 python 342 puzzle 341 shooter 268 strategy 257 action 222 space 153 other 152 libraries 151 simple 143 platformer 138 multiplayer 127 rpg 118 retro 98 applications 93 3d 87 gpl 82 pyopengl 74 snake 72 pyweek 71 geometrian 68 library 66 gui 63 physics 62 engine 59 simulation 55 adventure 52