Good pixelling, has a sort of Cave Story-ish feel to me (because of the desaturated colors and square clusters)
Though I don't know what game is it that you're talking about...
The clear-colored blobs on the clouds don't make much sense to me (there's no apparent lighting from the moon or whatever), and I don't know what the big thing on the far left is (then again, maybe because I don't know the game)