Repetitive.
Okay.....
The mastering on the song could certainly use work. The instruments sound too digital and a little more mastering is needed to bring them to life. Unless of course you were intending on this sound. Which I can't complain, some video games do have this sound to them.
As for the song itself. The melody is..... somewhat... creepy. Not very though. You didn't put enough into it to make it "creepy". Another thing is that you're repeating the same thing over and over again. Which is totally fine, but you're going to need more variation within your song so that it doesn't bore the audience out.
With that said, you could also make it longer by adding more variation to it. Also, the end to this..... is rather ear hurtful. Organ chord ending is fine... but not so loud.
Keep working on the song.
-HFX ^_^