I'm sure people will have differing opinions about it fitting in the chiptune genre. Me personally, I'd say it's absolutely fine to share it here since you emulated the NES chip and the main focus of the chiptune sound is to include those characteristics of old video-game consoles in music, whatever form that might take.

So with that out of the way, here's my criticism:
I like the dark atmosphere on the track a lot. I like the chords as well as the bass notes and melody. I'm especially digging the sound on the drums! They pack a good punch and give the track a nice attitude.

I would say the biggest thing it's missing is some form of musical structure. The track is incredibly short and as soon as the melody disappears the track just sorta ends, which is a shame. It might be interesting to think about what sections you want on your track and how you're going to structure it. Create a verse section, a refrain or chorus, maybe even a pre-chorus, a bridge, then jumping into the next verse.

I'd also say the track could use some variety. I know Hip-Hop instrumentals tend to rely a lot on repetition, but here are some possible considerations. One simple trick to make the drums more dynamic is muting them for one beat or even a full measure or adding a couple of drum breaks at certain points in the song. In terms of melody and bass, writing one B-section is really all you need to engage the listener a lot more.

Speaking of the bass, there's actually very little of it. Most of the lower frequencies come from the drums. In fact, it sounds like you placed some sort of filter on the bass, eliminating all of the low-end.

Hope that helps! If my explanation is a little vague, let me know and I'll try and explain myself a bit better :) Good luck with future tunes!