TUTORIAL: HOW TO JOIN ALPHA TEST HEROESTD ON ANDROID DEVICES
To join the Alpha Test of HeroesTD, first access to the following link: https://play.google.com/apps/testing/com.cgstudio.heroestd
Then follow the below instructions:
STEP 1: Access to the above link, then sign in the email you have registered for the Alpha Test
STEP 2: Download the Alpha Test App on Google Play by accessing to the following links:
STEP 3: Install the app, when the downloading is finished, you can enjoy HeroesTD right then.
For further detaited tutorial, you can take reference from the below tutorial video: