Round based Zombie Shooter project

Round Based Zombie Shooter

Hey folks, going to be diving into another project. I've also released my previous project for free for anyone who is interested in trying out my first launch of a game(its actually kinda scary). Any-who lets jump into this project. 
My idea for this game will be try to survive "X" amount of rounds. It will be hopefully 40+ rounds altogether. With many dynamic gameplay factors including difficulty, environment, player debuffs / buffs, and designing the bosses in a unique way where he will fight a different strategy each time you fight him, though I have never attempted a boss yet so knock on wood I do hope that turns out well :P!

  So far I have a few systems set up already for the basics, which include;

• something to spawn hordes of zombies,
• a timer to call the spawn whenever a new round begins,
• models which dynamically change each of the zombies clothing on spawn,