Would you be able to implement explosive weapons in some form?
Such as grenades, RPG's or the like. Or perhaps at least shrapnel-explosive rounds upgrade.
I'm not sure if this has been suggested before, but the game needs the "autobuy" function badly to allow for making some progress while actually idling.
I wouldn't mind more purchasing options, instead of simply having the option to "buy one" or "buy max". Either add the usual increments of 10 (10,100), or implement slider or another way to purchase the desired amount of upgrades.
Can we get the option to mass purchase cash/angel upgrades? The option to sort the upgrades of the same category (all profit upgrades for example) would be great to reduce spam clicking for upgrades as well.
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You'll earn more souls in later levels, as there will be more zombies, but I'll take that as feedback that upgrades are currently too expensive.