This is a NGADM Round 1 Review!
I'll be straight with you and say that usually chiptune gets on my nerves and makes my ears bleed unless it's treated properly but... You did treat it well so you can let out that breath you were holding in now. ;P
I'm glad you didn't use super harsh sounding saw waves etc that so many people tend to use in chiptune. People don't realise how pure tones like those work psychoacoustically. Be cause they're so pure they tend to be that much louder (compared to, say, an acoustic instrument which has an extremenly complex sound full of harmonics etc which phase in and out as the string etc vibrates).
I think the percussion could have maybe been a little more interesting, maybe had a bit more bite (my favourite retro drum sound is the kit used in Sonic on the Megadrive, man I love that OST).
Quite a few good ideas throughout which flow well together and there's a fair amount of variation/variety. It doesn't feel boring or repetitive. At the same time I don't think it's "amazing", it didn't have a killer moment for me, a high point or something. That would have got you the higher score.
Well you convinced me to like your piece despite it being chiptune so that's a good sign! 8/10 score, congrats!