This app was mentioned in 2 comments, with an average of 1.50 upvotes
It's pretty simple, but it's quite a bit of fun and it's the best tower defense I've played for Cardboard. Here's the Play Store link.
Project Title: Trinitaria VR
Promotion Type: Awareness / Feedback / News
Promoter's name and role: dxsigh //programmer and designer
Links: https://play.google.com/store/apps/details?id=com.garentgames.teamdefender
Description: Trinitaria VR is a tower defense game on Google Cardboard Android and like other tower defense game, you have to build a tower to defeat enemy. In this game you can upgrade your skill permanently, shoot enemies, and have many type of tower and enemies and it's a low poly 3d model art