Chillwave sounds like somebody just put the synthpop and shoegaze I listened to as a kid in the 80's and early 90's in a blender. I do like the bedroom quality engineering on a lot of these though. Reminds me of trading cassette tapes of music you made in your garage when you were younger.
My selection is from one of the guys you'd frequently hear at any chillout room at a rave in the mid-nineties, though this piece is off his 2006 album Jeux Dangereux. Most of Pete Namlook's mid-nineties stuff is super hard to find, very minimal and very long, so I'll spare you that. This one even has vocals, a rarity for Pete.