Hello,
Just by quick glance, I’m thinking it’s only not pannable because you have an invisible dialogue which creates a pause so you’d have to first click once to remove the hidden dialogue and then the game/panning will begin. If you don’t click once to clear the hidden dialogue, you won’t be able to pan because the game has not yet started until you remove the dialogue by tapping on the screen. So each time they go back to the start of the game, they have to tap once to clear that dialogue and then the game starts.
My suggestion would be to take out the unnecessary hidden dialogue and instead, right after the dialogue that says “Best of luck!” put @pause for 0 underneath it, that will remove the dialogue from the screen when the game starts instead of having to hide the dialogue to get it off the screen.
The way you have it currently will seem glitchy since it will be paused because of that hidden dialogue, naturally readers will tap on the screen if it seems frozen which will clear it but it would run smoother to just get rid of that hidden dialogue and adding that unnoticeable pause so that the game can start immediately when it’s supposed to.
But this is just at first glance. Maybe try that out. 
So add this quick pause at the end of this dialogue like this:
NARR
Okay, in just a moment this text box will disappear and you’ll be able to scan the room.
You will be able to click on objects in the room, perhaps finding something that can help you escape.
Best of luck!
@pause for 0
and then remove this part:
@speechbubble is 160 278 to 0%
NARR
. . .
right before the tappable game starts.
Also if you didn’t know, you don’t need to have dialogue right before tappable choices.