Just type in the answers to move forward. For example- "Should we go from the mountain route or the the on the map?(M/RR)" Type in the letter 'M' or type in'RR' and then accordingly something will happen.
The thumbnail has been written in alien script, a font from '"Fontisserie" by Madison' - https://scratch.mit.edu/projects/1079397054 Check the inside of this project for the font and the thumbnail's translation.