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Hey! I never saw this comment, sorry! Hope that you did find the answer to your question by now, but just in case - you can display variables in Twine by simply writing them within the prose, i.e. "There are $numberOfSheep sheep", and when you run your game its value will appear within the text like this: "There are 43 sheep".

There are cooler things you can do with variables too, a lot covered in the Twine manual:  :) https://twinery.org/cookbook/terms/terms_variables

I'm going to use the jam as an excuse to learn Twine! Need myself a little project to get back into the swing of things after a period of solo dev hiatus - been too busy designing stuff at work! Thanks for the push to do this! Less a game, more a visual novel. But hey.