What a delightful little game! I'm a huge fan of the board game Formula D which this is based on, so I was absolutely thrilled when I saw the concept, and I absolutely could not stop playing until I'd beaten it. It'd be really interesting to see this concept expanded! The "exploration mode" you go into when you lose a race makes me imagine a game with a procedurally-generated "world map" based on interconnecting highways, where you can find enemies to challenge (or who would challenge you, like a hostile Nethack enemy) with some amount of reward/penalty attached to the race. Add that to the concept you mentioned about upgrading your car's gear dice and that's the start of a really interesting adventure game!

Yes, a little well made rogelikish turn-based car game. Neat. I’m a bit sad I didn’t properly understand why I loose sometimes 🤔.