I made this demo for a mix genre study. And I found many like the idea, so I decided to release it on Asset Store.

This demo combine tower defence genre and first person genre. The player can select different turrets to build, and upgrade the turrets or sell them. You need to spend money on building or upgrading, and you can get money by destorying enemies or selling turrets.

I used Brackey's tutorial on Tower Defence, and you can easily learned how to make a first person view tower defence game with this asset.