Was a little too late with writing the dev log - here is the link: https://flavedogame.itch.io/lost-and-pounced/devlog/510217/in-game-tutorial-ui-a...
When you play the Browser Version, you can find the fullscreen button at the bottom of game viewport - it might be out of view, some vertical scrolling is needed.
Making the gameplay more understandable was our goal for this Jam :-D Anything in particular, that irritated you?