I thought the idea of the game was a fun one. Getting upgrades to try and better your place in races to earn more money is a pretty tight little game loop.
I think the player gets too easily lost amongst the number of NPC players in the race. It takes several moments, once the race starts, to get my eyes on the player, and, once I do, I’ve probably already run my guy off a cliff or against a wall, loosing me some valuable time.
I like that the race levels are short, but I feel that ledges and platforms aren’t the best idea. I know there’s an upgrade for higher jumping, but what I feel might have worked a little better would have been ramps and inclines for hills. Then the player could be slowed down trying to run up hills, instead of flat out stopped at jumps. Then the jump upgrade could be turned into a dexterity upgrade which would allow you to run up hills a little faster.
Over all, I think this has a solid idea!