missing mystery boxes, the ghoul movement is not natural that it almost feels like they are flying basically its hard to dodge ghoul than the original cod one, and only 1 weapon slot which is not good should be 3, u should add a melee that have waves=howmanyhitsrequiredtokillaghoul, so its 5 hits on wave 5 and the stronger ur melee the less hits u need while progressing also add the option to have beers in inventory/backpack so we can use whenever we needed it but make it that u can only pick 3 max, and make the game pauseable somehow, i know its hard to do most of what i said but if you want it to be good/playable i think this is what u need to do, and other than what ive mentioned ur game is good
