I dont know if your still developing this (i really hope you are) but i have been playing this a bit and if it helps i found two bugs. The first is that the ppbizon buy thingy doesnt work, and second when you buy the door next to the stairs, the one with the p90, then the zombies can spawn outside by the entrance where they can find their way to the player.

Thank you very much! I like the idea of having to use all 3 to make them respawn. I guess I'm using something like that :)

Heres a idea: what if you made a mystery box but for attachments. Maybe you could put in your gun and it would get random attachments. Or just have 3 attachments (one of each type) spawn which you would be forced to use before spawning new ones.

Keep up the great work man! cant wait for it to be finished