My brother coaches middle school track. His coaching tips to the athletes: "Run fast!!!"
That's the best he's got apparently. ???
Welll.....in that same spirit, here's my advice for Satan's Hollow: "Don't die!!!"
More importantly, don't give up!! And some advice that might actually help: while you're learning, don't cross the bridge as soon as you complete it. Hang around completing waves as long as you can then use the bridge for an emergency exit. Just be careful that the bridge bombers (red gargoyles) don't blow it up before you escape. The more waves you clear, the more bonus 1000s you get for defeating Satan. As you get better, you should cross the bridge every chance you get. Because you get the bonus 1000s again, and again, and again.
And...don't die.