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WHOOPS

Don't forget to check out at the counter.

My very first level, three floors. I'd say it's easy, maaaybe medium if you're going for the intended Rank S. Not many enemies.
Rank S requirement is supposed to be to execute every single enemy, so no instant kills. Buuut I think I kind of messed that up, and I'm too lazy to update it. Make it a self-imposed challenge, I suppose. It's possible.

Mods included:
Pardo to Gangster by Available_Complex_69
The Hooded Gangsters by TheLegoMack and Bizzard