Gravity Waves is a twin stick shoot 'em up in space with realistic gravity against enemies attacking in waves which build from a gentle pace to very very hectic. Gain extra points for close-up kills and using planets, moons and the sun to slingshot you with their gravity. Wnemies drop health boosts and occaisionally extra lives. The gravity takes a little getting used to but it provides gameplay that changes moment by moment and totally keeps you on your toes.