Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download 2D Wave Shooter Free.
2D Wave Shooter v1.1
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About
2D Wave Shooter is a game template which can be used to create a top down wave game. The game features 2 Maps, with explodable barrels, pickups, different enemies and a shop which can be used to upgrade player stats and attachments for your gun. This template is easy to modify as many variables can be tweaked, and sprites and sounds can be replaced. The scripts are neat and well documented. This asset also comes with a free copy of ‘Toolbar 2D’, an asset made by me.
Features
> 2 Maps
> Wave spawning system
> Shop, with upgradable gun and player stats
> Royalty free sound effects
> Pickups (Health, Money, Ammo)
> Explodable barrels
> Saves your highscore
> Fully documented
> A fully working wave shooter
> Different enemy types (Zombie, Fast Zombie, Tank Zombie)