Tweens are mostly useful if you want to create simple code-driven animations for which you don't know parameters in advance.
If animations are more complex, you can still use
AnimationPlayer, but with a small trick: before playing an animation, find keyframes you want to change parameters, then play the animation.
What's with "the way to do it if you are indie"?
(sorry I couldn't see the video, my HTML5 browser doesn't have Flash)