So, it's literally Super Mario Kart!!
You did an excelent job recreating every original mechanic and element, even the objects are here. You improved the game's physics too! It's such a great job in such a small amount of time. I can say this is a faithful remake in every aspect we can mention.
I'd have appreciated to see your own ideas, characters and mechanics implemented in your own karting game. I mean, even if your twists to the concept can be amazing to see, Nintendo isn't kind with these kind of projects. But now, you're able to create some kind of spiritual succesor of this SNES classic, I'm sure it could be succesful.
All in all, you made an incredible game!