Block Tap to Spawn

Yes, you could do something similar to this touch depth sorting script that Olha shared: https://support.lensstudio.snapchat.com/hc/en-us/community/posts/360059703172/comments/360009928591

You don't have to base the compare value on render order, when I do it I just use numbers or an if statement checking what it is.

The logic is basically:

Make custom touch controller script

On all touchable things, make a custom touch function that feeds to that touch controller

Save a pool of the custom touch events as they are called and in a  *late* update event use a comparison on them to determine which custom touch event's callback to actually trigger

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This isn't the only way of course though, you could also just check a touch position in screen space vs your UI to see if it overlaps. Always a few options