a hell of a time down here

[kadioguy]

In this game video: https://youtu.be/m4BTJxjI63g?t=14

When the player chooses to join the Devil's team, the Devil says, 'You're mine now! And we're gonna have a hell of a time down here...!!'

What does 'we're gonna have a hell of a time down here' mean?

 

[kadioguy]

What does 'down here' mean? Does it mean 'here' in a emphasized way?

 

[probus]

What does 'down here' mean? Does it mean 'here' in a emphasized way?

No. Heaven is traditionally thought of as up, perhaps in the sky, while hell has the connotation of down in some world below.

 

[Skrej]

'Hell of a time' can also mean to have difficulty accomplishing something.

I'm having a hell of a time changing my car's oil.