Bye SWIFT, hello Kotlin.
Besides, for cross-platform development I will use only language which is supported by platform IDE, like Xcode and android studio. Thats means no way for SWIFT as language for cross-platform game development. Looks like C++ is only one right way..
However, If there will be some solution like was from Apportable - so I can just create my game in Xcode and compile, debug and run it on android device right from Xcode, thats would be amazing.
Otherwise console compiling for android is crap. Nobody will use it. Thats I'm talking about some compilers for SWIFT to android. It's should compiles in native IDE's..