Let me tell you, you absolutely nailed the COD Zombies inspiration. You captured the essence of the original maps really well, and the whole experience felt incredibly nostalgic.
Overall, the game is very solid, and the round system works great. The enemies are funny, although some of them can be pretty difficult to escape from.
I only have a couple of small suggestions. It would be helpful to add some kind of indicator near the doors, since it took me a while to realize they could be opened. I only found out because I happened to walk close enough to see the price. Also, with the starting melee weapon, it feels almost impossible to kill an enemy without taking damage. I couldn’t find a reliable way to avoid getting hit.
This is a very strong entry and a really enjoyable game. Congratulations!