You should add a bassline after about 4 or 8 bars of the flute-like instrument.
This track is begging for it, and the introduction of a bassline will inspire you to add more features to the song.
Listen to the likes of "VHS Glitch" for some ideas of a bassline.
The Analog Lab VST has lots of great retro bass sounds, and is not very expensive if you buy it at the right time.