Just some general advice in case there are other players struggling like the reviewer who spent 5 hours getting their 1st clear.
You might want to invest in Speed. If you can't one-shot the demons, and you're not able to run away from their attack, they'll obliterate you. 20 speed was enough for my 1st clear.
For big waves of enemies, try using an explosive weapon. The kunai or explosion staff are great. You can even buy the Gyaru for even more explosive damage!
If you hate building defense, watch out for enemy ranged attacks. The pumpkin guys will shoot their little laser at you even if they're dead, so keep strafing.
And of course, don't slack on Luck. Rarer items like the free-reroll ticket are essential later on, when rerolling costs hundreds of monies.
Well that was my experience anyway. I'm sure others had great success with other builds, too.