This is a very short and simple visual novel. I love the original artwork! It's really the strong point of this game. The design and color scheme look great and fit the vibe of a chill road trip. I also love Mochi! He adds a fun personality to the story and adds complexity to the main character that I don't think would be there if the only thing they were able to interact with was Maps.
Here are a couple thoughts if you decide to do anything else with the game:
My main suggestion is to add more artwork. The entire dialogue took place in the exact same scene. Maybe you could draw a different image that appears for each ending or have a different image appear for each fork in the story. I think the game would feel more engaging if the decisions we made impacted the overall visual we see as we're playing.
Another suggestion is to add some variety to the riddles rather than having them all be "left or right" answers. One idea is a number riddle where you have to choose the correct exit to take. Although, adding complexity to the riddles may make the game feel more complex and less cozy overall, so it depends what you're going for.