This game is very cool, I liked the incremental challenges and privileges you need to sacrifice to keep moving forward!
It took me a while to notice the player's hitbox is the heart, so maybe just make a mini car the size of that heart to be the player's hitbox instead? I just found it unintuitive. Or maybe make the car darker so the heart is more prominent?
Nonetheless this game looks like it had a lot of care put into it! Amazing job, very clever and very fun to play!