The site requires at least one hundred words for a review, which is tough for a game which has as little content as this one does.
This is an extremely minimalist game without much value to it. It is free, but there's nothing here worth experiencing.
Seriously, You just fly upwards for a bit.
I'm not sure what else there is to say here. It is a very artsy-fartsy thing.
The only reason to play it is for the achievement and get another perfect game on your record. The whole game takes maybe 15 minutes to complete, if that, but you aren't going to experience anything meaningful or worthwhile in the process.
.5