Good songs to listen to from not so popular games?

[TruckOSaurus]

I'd say the soundtrack of Risk of Rain and Child of Light in their entirety.

If you want sample tracks form each

Coalescence (Risk of Rain): https://www.youtube.com/watch?v=ysPtBjY8o_A
Aurora's Theme (Chid of Light): https://www.youtube.com/watch?v=Q6IPtRIDzoA