This game came out at the height of the military shooter era, so it largely went unnoticed by the game community. However, it has amassed a cult following and for good reason--it's absolutely insane. The screenshots alone show the game's kaleidoscopic, eclectic art style. A few of these screenshots don't even look like they belong to the same game.
Games like this need preservation more than popular titles, because these games will be forgotten if they are not preserved. GOG, to me, feels like a store that gives games a second shot at life. El Shaddai isn't dead by any means, but it deserves a surge of popularity that GOG releases tend to bring.