The 2nd, 3rd, and 6th tracks really give me some Risk of Rain 2 vibes, and the last two tracks give me short of the 80s/90s Sega Genasis type of a vibe! As well mixed with those cool-sounding synths this is ear candy!
A lot of the synths were homebrew. They have lots of saturation in their filterbanks, which hopefully gives them a bit of that old time 80s-like feeling.