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It's just tweening image_xscale and image_yscale.

I recently found out about TweenGMS PRO. Is that what you use or is it just custom?

I didn't make this game btw.

Tweening is easy to implement custom. What's more important is how to use tweening.

I recommend watching this, if you haven't already: https://www.youtube.com/watch?v=Fy0aCDmgnxg

Thanks!