Animate vs Legacy in On Game Update

The animations in the new APIs reset when called multiple times. Instead of calling it every frame, you should only call it once when you start moving left or right:

Alternatively, I made an extension to make this sort of thing much easier. If you add this extension to your project:

riknoll/character-animations

You get blocks that capture this behavior along with a few other common scenarios:

It’s on my to-do list to get this in the default extension list.

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