Nice game! Just a few suggestions:
- Adding some checkpoints between sections would make the game more enjoyable and prevent having to restart from the beginning if you fall near the end
- Personally, I felt like you stay in the air when jumping for too long, which made it difficult to judge when and where to jump, so I would suggest fixing that
- This is a really minor one, but I felt like the game over music and screen didn't really fit the vibe of the rest of the game, so maybe consider using a different sound and a different font
Overall, good game!