Defense Derby is a new mobile game in the tower defense genre. The registration period for the pre-test is from September 1st to 14th. You can register for the beta on their official website.
Once selected, you will receive the link for the pretest in your registered mail.
The testing period starts on September 15th. The early access will be available only on Android, iOS gamers will be able to test it out later (no date available).
The requirement for Beta test is as simple as having a smartphone like Samsung Galaxy S8 with Android version 5.1
As far as the gameplay is concerned, the developers have promised a new PVP with simple mechanics. You select a deck of cards and summon your units on a 3×3 field. Your units will take out waves of enemies with the only goal to stop them faster than other players