Interesting game! I enjoy how you added logic to the story, such as with the cloud-platforms getting smaller because of low air pressure. I thought that was super creative. Here are some suggestions if you wanted to improve:
1. Make sure your text has some sort of background to it. Even a transparent black would be nice. In the tutorial it was sometimes hard to read with the clouds moving past the text.
2. The jump felt extremely slow, this slowed down the entire pace of the game some, it does work but it could make the game feel better if it was faster.
3. The window scale appears to be off with half the score on the top being cut off, this could just be an issue on my side but you might want to look into it some.
4. Some particle effects when landing or jumping could also help to improve the overall game feel by giving everything more of an impact.
Overall fun game, would enjoy to see a post jam version that continues to work on it in some way!