I need to perform animation on collision:

box.onCollision {
  view.tween(...)
}

How do I pass the coroutine context there? Is there something like

box.onCollisionSuspended {..}

?

You shouldn't use

Dispatchers.Default

since KorGE has its own dispatcher, and that would use a different thread and you might have issues on some targets, you should propagate the coroutineContext of either the views, or a scene (that would handle its lifecycle)

Could you give me an example of how would I access the

views

singleton from a random place in the program?

You can't. You have to propagate views, or an instance containing views. For example scenes contain views. If you have a suspend function, you can access the vies with

views()

the coroutine context if propagated properly should have the injector referenced