If you haven't played many 4X/turnbased games:
XCOM: Enemy Unknown:
Personal favorite part:
You might have already heard about this one, but just in case:
Transistor:
Feel free to ignore the ones with vocals if you're not a fan (the description of the youtube video has stars next to all the ones with lyrics), but the rest is good regardless.
Also, Risk of Rain. Good stuff: https://chrischristodoulou.bandcamp.com/album/risk-of-rain
Favorite bit: https://chrischristodoulou.bandcamp.com/track/chanson-dautomne
Before I forget:
Happy Birthday!