Ok! The only real not good part of this song is the start, where the synth is a bit choppy and off rhythm, but I suppose you just need to practice a bit more in that field. The Dubstep sounds extraordinarily good, nothing Teminite like, but it’s still very good! The transitionings are also pretty good! Siren there could’ve been turned down a bit and given some extra reverb, and to make your song sound more intense, you could’ve used distortion to make it sound more threatening!
The drums are also really well made in my opinion! There also probably could’ve been a better way to end the song then just a sudden stop, possibly a cymbal, and if your feeling ambitious, another melody pattern with some dark aspects.
Final conclusion!
Very good work, could definitely be used in geometry dash. Keep going!