Too much sidechain
the melody can barely be heard. The track is separated into 2 parts, the kick, and everything else. The clap was near lost in the mix, along with the a lot of the hat frequencies. Your bass is being gobbled by this large sidechain you got going. The general mastering is not great, but i expect you to fix all this since this is a small demo. overall, decent job, I would just stray away from this overwhelming (to the mix, not the ear) sidechain and general bass that's being gobbled.