This song is basically one chord with a background. Have you tried changing chords sometimes or adding some melody? Or even some basses? Melody 4/10
Atmosphere is good but it really misses a melody. Atmosphere 7/10
Mixing... I can't say anything to mixing. 9/10
4+7+9 = 20 /30
20/3 = 6.6
Rounded 7.
Final score: 7/10