It took me a while to understand this game. The instruction says "Press space bar" not "hold space bar" So I was running around pressing space bar trying to catch the spirits as they escaped, being confused as to why I only had a second before they vanished and escaped forever.
After a few goes I realised I had to hold space down when the black bar appeared, and then eventually I made Hades happy.
The music does fit, but I feel it gets a bit annoying after a while.
I do like the old school graphics. Nice work.
Would be fun to see it expanded upon, bigger graveyards, hazards like crows maybe, or other such things to hinder progress.