Scratch

Anybody have suggestions for a mario kart game? Right now I am thinking of haveing:

4 Races, Mario Circuit, Bowsers Castle, rainbow Road and Ghost Valley. I may add a vanilla lake or Donut plains in there.

One playable character but racing up to 3 "Ghosts" They just kind of do there own thing, like the ghosts in real mario kart games.

3 power-up thingys, Mushroom, Cloud and Double Mushroom.

Jumps, speed ramps and those things.

Anything else I should add/consider?