This game is really cool. Having to go collect my ball really changes how I approach combat, I had to be a lot more careful about my shots. I definitely found it difficult, I probably did 15 or so runs and never got of floor 1. I always made silly mistakes juking zombies (They are very tanky) and took a bunch of damage.
I really like this art style too.
Gunna try a few more runs to see if I can improve. I think getting the right item is key, I'm not sure if there is a way to see what each item does but I think the one that lets me summon the ball is my favorite.