Now it's up for pre-order, ready to be released in the coming days, and not only is Gravity Ghost 33% off but you get a spare copy for a friend, DRM-free through the Humble Store
Gravity Ghost uses all you learned in high school geometry to create a fun experience that makes math useful in a cosmic adventure, even if the story does get occasionally dragged down. - Elise @ Electric Bento
"Let me sum up Gravity Ghost in one sentence. Gravity Ghost is a quirky and colorful indie game where you go around collecting the spirits of dead animals. Seriously!" Kyle at Game Freaks 365 writes.
PlayStation LifeStyle: "Gravity Ghost is a wonderful puzzle game, featuring vibrant level design, engaging story, and one of the best soundtracks for a truly zen experience."