So far: The newgrounds stuff is good, but reminds me more of the 16 bit era. I really like Hills, and Rockin your nes. Really good nostalgic tracks there. =D Neonbridge is very nice and nes-like as well. Reminds me a bit of balloon attack, or some of the Mega man to stuff with your drums.
Work in progress 2 is kind Genesis-like, but is a bit too busy IMO. Sometimes it sounds like there is too much going on, and some of the instrument levels could be adjusted so you main melody isn't being over run by the rhythm/background. I still really like the overall sound of the track though. I'll edit and add more thoughts after I look at and listen to the stuff on page 3. =)
*Edit* Ok, the spaceman remix is great. The most recent one you posted may need some adjustments on insturment levels, but not too bad otherwise.