Portability

Multi target to Java VM, JavaScript, C and VM

Beautiful Syntax

Generics type, lambda/closures, non-nullable type, async/await ...

Concurrency Safe

Built-in immutability and actor model, safe in compile time

Cross-platform UI Framework

Write once run on Android/iOS/Web browser/Desktop

Server-side Framework

Web framework, database ORM, template engine, async/await based IO framewrok ...