9.03m is a game that I don't think needs to be reviewed. It's intention is not to be a ground breaking evolution of the medium, nor is it supposed to even be fun. A short 15 minute experience, it is meant to be a game of remembrance; dedicated to all that were affected by the disastrous tsunami that hit Japan in 2011.
Similar to something like Proteus, 9.03m doesn't have a narrative or any real mechanics to speak of. Wandering along a quiet beach, you are asked simply to follow the trail of butterflies which lead you to the scattered items of the people that used to live there. It's a decidedly somber experience, but also a very beautiful one (both in terms of presentation and purpose), the core message is one of hope; that those who were lost are not forgotten, and those who survive will be able to rebuild and live on despite the tragedy that befell them.
With how little it costs and the fact that 100% of the proceeds go to charity, there is no reason I would tell someone not to support 9.03m. It doesn't matter that it's short, or that it's hardly a game, because it isn't supposed to be; it is merely intended as a short moment of reflection, and has more meaning behind it than possibly anything else you will play in a long time. That alone is reason enough for me to ask you to give it a chance, whether it looks like something that would normally interest you or not.