finally i finished this game!
tip:
you may want to run when needed... like... forever
Or run summoning build with bullet damage up and exploding bulelts with the crossbow and just stand there watch the fireworks. I didn't even have to run to survive, and got over 4k enemy kills. The only non-running way I've yet found to survive, with the downside that it lags the game at the end because you're spawning so much gold and so many bullets.