Difficult but fun. :) Reminds me of the good ol' Micro Machine games, with the drift element mixed in; a bit more of a challenge. The 'mania' part maybe in homage to the Trackmania games? Seems like this'd require a similar amount of practice to perfect, getting Silver on all tracks was challenging enough, Gold... I think I'll leave that be for now!
Love the design; gameplay; progression with the level designs too, progressively both all the more difficult and all the more creative. And the garage is a fun little addition for continued play.
Had a blast with this, nicely done! Ghost mode really is a big feature too.
-cd-