Excellent choice about the numeric stamina! This would be my choice also!
As far the different layouts are they really necessary? After all there are max 2 different layouts needed for a game. A desktop layout and a mobile layout. The current layout (desktop layout) can easily be used for the mobile version in landscape mode. As a fellow developer (I know the cost of different layout for different devices all too well) I think it is best to stick to one (current) layout.
Maybe I didn't explains correctly about the "exit" bullet (sorry, English isn't my native language). Let's me give you an example instead about the "action menu":
* do action 1
* do action 2
or choose a exit to move
[directions icons here]
if no actions except exit are available simply show "choose a exit to move" and the icons
In any case the exit bullet is a minor thing so...
As far the stamina cost it look to me like too many variables outside the player control that can affect the actual cost. I personally don't like at all the second reason you refer (the one about being a trick). Since this is a text game with minimal graphics how the player can deduce it's a "trick" cost instead of an actual one? In the first version of your game (which now that I remember it has a few of those trick costs) I always consider myself lucky of passing some check instead of realizing that is a trick cost.
I hope my questions/suggestions haven't offended you in any way. I really like your game.