Strong entry, but nothing to put it over the top.
I liked the song, but there was nothing that made me go "wow, that's awesome," or, "that's such a sick idea". The core parts of the song are done pretty well; a decent bass (perhaps it could be a bit more powerful?), good tempo, and a melody that isn't annoying or dominating (this might be what could be improved on, but again I'm not sure).
Overall, it's not bad in any way, but it feels like it's lacking something. The "zero gravity" vocal at the beginning was nice; perhaps if you made a few more phrases that tie in with the theme of the song and disperse them throughout, it would strengthen the piece.
4/5, 8/10