I noticed when you touched the portal the frame stopped. How did you do it? Thanks!
You can use the pause system in Godot to do so. The code looks like:
get_tree().paused = false
Note that this will stop every node by default, including your portal. You can make it so some nodes are not paused by selecting them and in the Inspector, setting their Pause Process property to process.
Thank you! I'll look into it!