My submission for 1 hour game Jam:

 Original game:

https://play.rosebud.ai/p/1575a4f0-7773-4747-bb5f-d3cefa80e136

1. Added Nitro
2. Added levels
3. Widened road
4. Added 999 bonus
5. Added a pause button
6. Made driving smoother
7. Now playable with arrows

Iterated game:

https://play.rosebud.ai/p/ebee9d1b-8325-4f6d-8985-de8795640159

Highest score I got! 17202